H2
Download websites using H2O
Server Software · since 2014 · open source
373 sites
-79.68% YoY
Latest export · 0 days ago
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Requires a dataset purchase
About H2O
H2O is a high-performance, open-source HTTP/1.1, HTTP/2, and HTTP/3 server developed primarily by Kazuho Oku and contributors. Written in C, H2O was designed from the ground up to maximize throughput and minimize latency, featuring an event-driven architecture with support for QUIC and TLS 1.3.
H2O is notable for its early and complete implementation of HTTP/2 server push, header compression, and prioritization. It is used by performance-conscious organizations as a front-end server or reverse proxy. H2O supports Mruby scripting for flexible request/response handling and integrates with standard Unix tools. The project is distributed under the MIT license and maintained as an open-source community project.
At a glance
CategoryServer Software
LanguageC
LicenseMIT
First release2014-01-01
373
Sites detected
0.0%
Of all websites
-79.7%
YoY change
2.3.0
Most used version
Database preview of H2O sites
H2O detection is a value inside the Technologies column. Two datasets carry it — switch between them to compare what's included.
webatla-technologies-h2o-2026-06-13.jsonl.zst · 373 rows · 1 B · 14 columns
Daily fresh export
| Domain | TLD suffix | TLD | Domain type | HTTP status | IP address | Country by IP | Social networks | Technologies last data checked | Technologies | PR value | Harmonic value | Domain creation date | Domain expiration date |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| andydavies.me | me | me | ICANN | HTTP 200 | 178.62.63.18 | GB | {"x-twitter":["https://twitter.com/andydavies"]} | 2026-04-26 | C, H2O 2.3.0, RSS, Ruby, HTTP/2, Jekyll, jQuery, GoDaddy, Modernizr, Octopress | 0.00000188366 | 17,357,180 | 2011-09-27 | 2028-09-27 |
| lowreal.net | net | net | ICANN | HTTP 200 | 160.16.210.51 | JP | {"github":["https://github.com/sponsors/cho45?amount=3&frequency=one-time","https://github.com/dandavison/delta","https://github.com/cho45"]} | 2026-05-19 | C, H2O 2.3.0, PWA, RSS, HSTS, HTTP/2, HTTP/3, Cloudflare, Open Graph, Google Workspace | 0.000000258339 | 16,646,942 | 2004-04-05 | 2030-04-05 |
| hsbt.org | org | org | ICANN | HTTP 200 | 188.114.96.3 | US | {"github":["https://github.com/hsbt"],"facebook":["https://facebook.com/hiroshi.sbt"],"x-twitter":["https://twitter.com/hsbt"]} | 2026-05-13 | C, H2O 2.2.5, HTTP/2, Cloudflare, Google Analytics GA4 | 0.0000000497269 | 14,140,955 | 2004-04-08 | 2027-04-08 |
| katsyoshi.org | org | org | ICANN | HTTP 200 | 202.181.103.221 | JP | {"x-twitter":["https://twitter.com/katsyoshi"]} | 2026-05-16 | C, H2O 2.2.5, PWA, HTTP/2, Cloudflare, Font Awesome, Google AdSense, Google Workspace | 0.0000000213001 | 13,664,434 | 2011-05-25 | 2027-05-25 |
| irori.org | org | org | ICANN | HTTP 200 | 111.89.165.55 | JP | {"github":["http://github.com/hirose31"]} | 2026-05-15 | C, H2O 2.3.0, HSTS, HTTP/2, HTTP/3 | 0.0000000169218 | 13,045,422 | 2000-02-06 | 2027-02-06 |
| … | … | … | … | … | … | … | … | … | … | … | … | … | … |
| Domain | TLD suffix | TLD | Domain type | HTTP status | IP address | Country by IP | Social networks | Technologies last data checked | Technologies | DNS last data checked | DNS Status | DNS records | PR value | Harmonic value | RDAP/WHOIS last data checked | RDAP/WHOIS method | Domain creation date | Domain expiration date | Domain last changed | Registrar | RDAP/WHOIS Record | Response Status RDAP/WHOIS |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| andydavies.me | me | me | ICANN | HTTP 200 | 178.62.63.18 | GB | {"x-twitter":["https://twitter.com/andydavies"]} | 2026-04-26 | C, H2O 2.3.0, RSS, Ruby, HTTP/2, Jekyll, jQuery, GoDaddy, Modernizr, Octopress | 2026-06-08 | TRUE | {"A":["178.62.63.18"],"MX":[{"host":"mail.vhdns.net","priority":0},{"host":"mx.daily.co.uk","priority":10}],"NS":["ns41.domaincontrol.com","ns42.domaincontrol.com"],"SOA":{"mname":"ns41.domaincontrol.com","retry":7200,"rname":"dns.jomax.net","expire":604800,"serial":2024113000,"minimum":600,"refresh":28800},"TXT":["google-site-verification=oLYv-8sfM6T5JuvdNftrIF-ADT8URHpHigQ702W00Qk","yandex-verification: b5630dd197270b28"]} | 0.00000188366 | 17,357,180 | 2025-07-06 | WHOIS | 2011-09-27 | 2028-09-27 | 2024-11-30 | Mesh Digital Limited | {"raw_response":"Domain Name: andydavies.me\r\nRegistry Domain ID: c9e948ce340a4855902a36dd86e3b38a-DONUTS\r\nRegistrar WHOIS Server: domains.meshdigital.com\r\nRegistrar URL: http://www.domainbox.com\r\nUpdated Date: 2024-11-30T16:21:16Z\r\nCreation Date: 2011-09-27T10:14:30Z\r\nRegistry Expiry Date: 2028-09-27T10:14:30Z\r\nRegistrar: Mesh Digital Limited\r\nRegistrar IANA ID: 1390\r\nRegistrar Abuse Contact Email: abuse@domainbox.com\r\nRegistrar Abuse Contact Phone: +1.8779770099\r\nDomain Status: clientDeleteProhibited https://icann.org/epp#clientDeleteProhibited\r\nDomain Status: clientRenewProhibited https://icann.org/epp#clientRenewProhibited\r\nDomain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited\r\nDomain Status: clientUpdateProhibited https://icann.org/epp#clientUpdateProhibited\r\nRegistry Registrant ID: REDACTED\r\nRegistrant Name: REDACTED\r\nRegistrant Organization: Domains By Proxy, LLC\r\nRegistrant Street: REDACTED\r\nRegistrant City: REDACTED\r\nRegistrant State/Province: Arizona\r\nRegistrant Postal Code: REDACTED\r\nRegistrant Country: US\r\nRegistrant Phone: REDACTED\r\nRegistrant Phone Ext: REDACTED\r\nRegistrant Fax: REDACTED\r\nRegistrant Fax Ext: REDACTED\r\nRegistrant Email: REDACTED\r\nRegistry Admin ID: REDACTED\r\nAdmin Name: REDACTED\r\nAdmin Organization: REDACTED\r\nAdmin Street: REDACTED\r\nAdmin City: REDACTED\r\nAdmin State/Province: REDACTED\r\nAdmin Postal Code: REDACTED\r\nAdmin Country: REDACTED\r\nAdmin Phone: REDACTED\r\nAdmin Phone Ext: REDACTED\r\nAdmin Fax: REDACTED\r\nAdmin Fax Ext: REDACTED\r\nAdmin Email: REDACTED\r\nRegistry Tech ID: REDACTED\r\nTech Name: REDACTED\r\nTech Organization: REDACTED\r\nTech Street: REDACTED\r\nTech City: REDACTED\r\nTech State/Province: REDACTED\r\nTech Postal Code: REDACTED\r\nTech Country: REDACTED\r\nTech Phone: REDACTED\r\nTech Phone Ext: REDACTED\r\nTech Fax: REDACTED\r\nTech Fax Ext: REDACTED\r\nTech Email: REDACTED\r\nName Server: ns41.domaincontrol.com\r\nName Server: ns42.domaincontrol.com\r\nDNSSEC: unsigned\r\nURL of the ICANN Whois Inaccuracy Complaint Form: https://icann.org/wicf/\r\n>>> Last update of WHOIS database: 2025-07-06T12:28:09Z <<<\r\n\r\nFor more information on Whois status codes, please visit https://icann.org/epp\r\n\r\nTerms of Use: Access to WHOIS information is provided to assist persons in determining the contents of a domain name registration record in the registry database. The data in this record is provided by Identity Digital or the Registry Operator for informational purposes only, and accuracy is not guaranteed. This service is intended only for query-based access. You agree that you will use this data only for lawful purposes and that, under no circumstances will you use this data to (a) allow, enable, or otherwise support the transmission by e-mail, telephone, or facsimile of mass unsolicited, commercial advertising or solicitations to entities other than the data recipient's own existing customers; or (b) enable high volume, automated, electronic processes that send queries or data to the systems of Registry Operator, a Registrar, or Identity Digital except as reasonably necessary to register domain names or modify existing registrations. When using the Whois service, please consider the following: The Whois service is not a replacement for standard EPP commands to the SRS service. Whois is not considered authoritative for registered domain objects. The Whois service may be scheduled for downtime during production or OT&E maintenance periods. Queries to the Whois services are throttled. If too many queries are received from a single IP address within a specified time, the service will begin to reject further queries for a period of time to prevent disruption of Whois service access. Abuse of the Whois system through data mining is mitigated by detecting and limiting bulk query access from single sources. Where applicable, the presence of a [Non-Public Data] tag indicates that such data is not made publicly available due to applicable data privacy laws or requirements. Should you wish to contact the registrant, please refer to the Whois records available through the registrar URL listed above. Access to non-public data may be provided, upon request, where it can be reasonably confirmed that the requester holds a specific legitimate interest and a proper legal basis for accessing the withheld data. Access to this data provided by Identity Digital can be requested by submitting a request via the form found at https://www.identity.digital/about/policies/whois-layered-access/. The Registrar of Record identified in this output may have an RDDS service that can be queried for additional information on how to contact the Registrant, Admin, or Tech contact of the queried domain name. Identity Digital Inc. and Registry Operator reserve the right to modify these terms at any time. By submitting this query, you agree to abide by this policy.\r\n"} | Domain is active |
| lowreal.net | net | net | ICANN | HTTP 200 | 160.16.210.51 | JP | {"github":["https://github.com/sponsors/cho45?amount=3&frequency=one-time","https://github.com/dandavison/delta","https://github.com/cho45"]} | 2026-05-19 | C, H2O 2.3.0, PWA, RSS, HSTS, HTTP/2, HTTP/3, Cloudflare, Open Graph, Google Workspace | 2026-06-03 | TRUE | {"A":["160.16.210.51"],"MX":[{"host":"alt1.aspmx.l.google.com","priority":5},{"host":"alt2.aspmx.l.google.com","priority":5},{"host":"aspmx.l.google.com","priority":1},{"host":"aspmx2.googlemail.com","priority":10},{"host":"aspmx3.googlemail.com","priority":10},{"host":"aspmx4.googlemail.com","priority":10},{"host":"aspmx5.googlemail.com","priority":10}],"NS":["bob.ns.cloudflare.com","roxy.ns.cloudflare.com"],"SOA":{"mname":"bob.ns.cloudflare.com","retry":2400,"rname":"dns.cloudflare.com","expire":604800,"serial":2404153209,"minimum":1800,"refresh":10000},"TXT":["google-site-verification=elbLRn5X4T5Sln4BWk_RCDtKlI_bpE4WbX477Ec2Ifs","v=spf1 include:_spf.google.com ~all"],"AAAA":["2001:e42:102:1807:160:16:210:51"]} | 0.000000258339 | 16,646,942 | 2026-02-28 | RDAP | 2004-04-05 | 2030-04-05 | 2026-02-28 | Cloudflare, Inc. | {"raw_response":{"links":[{"rel":"self","href":"https://rdap.verisign.com/net/v1/domain/LOWREAL.NET","type":"application/rdap+json","value":"https://rdap.verisign.com/net/v1/domain/LOWREAL.NET"},{"rel":"related","href":"https://rdap.cloudflare.com/rdap/v1/domain/LOWREAL.NET","type":"application/rdap+json","value":"https://rdap.cloudflare.com/rdap/v1/domain/LOWREAL.NET"}],"events":[{"eventDate":"2004-04-05T08:03:37Z","eventAction":"registration"},{"eventDate":"2030-04-05T08:03:37Z","eventAction":"expiration"},{"eventDate":"2026-01-13T10:23:16Z","eventAction":"last changed"},{"eventDate":"2026-02-28T18:21:13Z","eventAction":"last update of RDAP database"}],"handle":"116140966_DOMAIN_NET-VRSN","status":["client transfer prohibited"],"ldhName":"LOWREAL.NET","notices":[{"links":[{"rel":"terms-of-service","href":"https://www.verisign.com/domain-names/registration-data-access-protocol/terms-service/index.xhtml","type":"text/html","value":"https://rdap.verisign.com/net/v1/domain/lowreal.net"}],"title":"Terms of Service","description":["Service subject to Terms of Use."]},{"links":[{"href":"https://icann.org/epp","type":"text/html"}],"title":"Status Codes","description":["For more information on domain status codes, please visit https://icann.org/epp"]},{"links":[{"rel":"help","href":"https://icann.org/wicf","type":"text/html","value":"https://rdap.verisign.com/net/v1/domain/lowreal.net"}],"title":"RDDS Inaccuracy Complaint Form","description":["URL of the ICANN RDDS Inaccuracy Complaint Form: https://icann.org/wicf"]}],"entities":[{"links":[{"rel":"about","href":"http://www.cloudflare.com","type":"text/html","value":"https://rdap.cloudflare.com/rdap/v1/"}],"roles":["registrar"],"handle":"1910","entities":[{"roles":["abuse"],"vcardArray":["vcard",[["version",{},"text","4.0"],["fn",{},"text",""],["tel",{"type":"voice"},"uri","tel:+1.6503198930"],["email",{},"text","registrar-abuse@cloudflare.com"]]],"objectClassName":"entity"}],"publicIds":[{"type":"IANA Registrar ID","identifier":"1910"}],"vcardArray":["vcard",[["version",{},"text","4.0"],["fn",{},"text","Cloudflare, Inc."]]],"objectClassName":"entity"}],"secureDNS":{"dsData":[{"digest":"531D99AFCF949F1AD0F707183178FBAE97F06787316DF875A741D782B7E867AC","keyTag":2371,"algorithm":13,"digestType":2}],"delegationSigned":true},"nameservers":[{"ldhName":"BOB.NS.CLOUDFLARE.COM","objectClassName":"nameserver"},{"ldhName":"ROXY.NS.CLOUDFLARE.COM","objectClassName":"nameserver"}],"objectClassName":"domain","rdapConformance":["rdap_level_0","icann_rdap_technical_implementation_guide_1","icann_rdap_response_profile_1"]},"related_response":{"lang":"en-US","links":[{"rel":"self","href":"https://rdap.cloudflare.com/rdap/v1/domain/lowreal.net","type":"application/rdap+json","value":"https://rdap.cloudflare.com/rdap/v1/domain/lowreal.net"}],"events":[{"eventDate":"2004-04-05T08:03:37Z","eventAction":"registration"},{"eventDate":"2021-04-02T02:45:34Z","eventAction":"last changed"},{"eventDate":"2030-04-05T08:03:37Z","eventAction":"expiration"},{"eventDate":"2021-04-02T02:45:34Z","eventAction":"last update of RDAP database"}],"handle":"116140966_DOMAIN_NET-VRSN","status":["client transfer prohibited"],"ldhName":"lowreal.net","notices":[{"links":[{"rel":"related","href":"https://www.cloudflare.com/registrar/","type":"text/html","value":"https://www.cloudflare.com/registrar/"}],"title":"Cloudflare Registrar","description":["Cloudflare provides more than 13 million domains with the tools to give their global users a faster, more secure, and more reliable internet experience.","Register your domain name at https://www.cloudflare.com/registrar/"]},{"links":[{"rel":"related","href":"https://www.cloudflare.com/domain-registration-agreement/","type":"text/html","value":"https://www.cloudflare.com/domain-registration-agreement/"}],"title":"Terms of Use","description":["Data in the Cloudflare Registrar WHOIS database is provided to you by Cloudflare under the terms and conditions at https://www.cloudflare.com/domain-registration-agreement/.","By submitting this query, you agree to abide by these terms."]},{"links":[{"rel":"related","href":"https://icann.org/epp","type":"text/html","value":"https://icann.org/epp"}],"title":"Status Codes","description":["For more information on domain status codes, please visit https://icann.org/epp"]},{"links":[{"rel":"related","href":"https://icann.org/wicf","type":"text/html","value":"https://icann.org/wicf"}],"title":"RDDS Inaccuracy Complaint Form","description":["URL of the ICANN RDDS Inaccuracy Complaint Form: https://icann.org/wicf"]}],"entities":[{"lang":"en-US","roles":["registrar"],"handle":"1910","port43":"whois.cloudflare.com","entities":[{"roles":["abuse"],"port43":"whois.cloudflare.com","vcardArray":["vcard",[["version",{},"text","4.0"],["fn",{},"text","Cloudflare Registrar Abuse"],["email",{"type":"work"},"text","registrar-abuse@cloudflare.com"],["tel",{"pref":"1","type":["work","voice"]},"text","+1.4153197517"]]],"objectClassName":"entity"}],"publicIds":[{"type":"IANA Registrar ID","identifier":"1910"}],"vcardArray":["vcard",[["version",{},"text","4.0"],["fn",{},"text","Cloudflare, Inc."],["adr",{"cc":"US","type":"work"},"text",["","","101 Townsend St","San Francisco","CA","94107",""]],["email",{"type":"work"},"text","registrar-admin@cloudflare.com"],["tel",{"pref":"1","type":["work","voice"]},"text","+1.6503198930"],["tel",{"pref":"1","type":["work","fax"]},"text","+1.6502307173"]]],"objectClassName":"entity"},{"roles":["registrant"],"port43":"whois.cloudflare.com","remarks":[{"type":"object redacted due to authorization","title":"REDACTED FOR PRIVACY","description":["Some of the data in this object has been removed"]}],"vcardArray":["vcard",[["version",{},"text","4.0"],["fn",{},"text","DATA REDACTED"],["org",{"type":"work"},"text","DATA REDACTED"],["adr",{"cc":"JP","type":"work"},"text",["","",["DATA REDACTED","DATA REDACTED"],"DATA REDACTED","Kanagawa-ken","DATA REDACTED",""]],["contact-uri",{},"uri","https://domaincontact.registrar.cloudflare.com/lowreal.net"],["tel",{"pref":"1","type":["work","voice"]},"text","DATA REDACTED;ext=DATA REDACTED"],["tel",{"pref":"1","type":["work","fax"]},"text","DATA REDACTED;ext=DATA REDACTED"]]],"objectClassName":"entity"},{"roles":["administrative"],"port43":"whois.cloudflare.com","remarks":[{"type":"object redacted due to authorization","title":"REDACTED FOR PRIVACY","description":["Some of the data in this object has been removed"]}],"vcardArray":["vcard",[["version",{},"text","4.0"],["fn",{},"text","DATA REDACTED"],["org",{"type":"work"},"text","DATA REDACTED"],["adr",{"type":"work"},"text",["","",["DATA REDACTED","DATA REDACTED"],"DATA REDACTED","DATA REDACTED","DATA REDACTED","DATA REDACTED"]],["contact-uri",{},"uri","https://domaincontact.registrar.cloudflare.com/lowreal.net"],["tel",{"pref":"1","type":["work","voice"]},"text","DATA REDACTED;ext=DATA REDACTED"],["tel",{"pref":"1","type":["work","fax"]},"text","DATA REDACTED;ext=DATA REDACTED"]]],"objectClassName":"entity"},{"roles":["technical"],"port43":"whois.cloudflare.com","remarks":[{"type":"object redacted due to authorization","title":"REDACTED FOR PRIVACY","description":["Some of the data in this object has been removed"]}],"vcardArray":["vcard",[["version",{},"text","4.0"],["fn",{},"text","DATA REDACTED"],["org",{"type":"work"},"text","DATA REDACTED"],["adr",{"type":"work"},"text",["","",["DATA REDACTED","DATA REDACTED"],"DATA REDACTED","DATA REDACTED","DATA REDACTED","DATA REDACTED"]],["contact-uri",{},"uri","https://domaincontact.registrar.cloudflare.com/lowreal.net"],["tel",{"pref":"1","type":["work","voice"]},"text","DATA REDACTED;ext=DATA REDACTED"],["tel",{"pref":"1","type":["work","fax"]},"text","DATA REDACTED;ext=DATA REDACTED"]]],"objectClassName":"entity"},{"roles":["billing"],"port43":"whois.cloudflare.com","remarks":[{"type":"object redacted due to 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REDACTED"]]],"objectClassName":"entity"}],"secureDNS":{"dsData":[{"digest":"531D99AFCF949F1AD0F707183178FBAE97F06787316DF875A741D782B7E867AC","keyTag":2371,"algorithm":13,"digestType":2}],"delegationSigned":true},"nameservers":[{"port43":"whois.cloudflare.com","status":["active"],"ldhName":"bob.ns.cloudflare.com","objectClassName":"nameserver"},{"port43":"whois.cloudflare.com","status":["active"],"ldhName":"roxy.ns.cloudflare.com","objectClassName":"nameserver"}],"objectClassName":"domain","rdapConformance":["rdap_level_0","icann_rdap_response_profile_0","icann_rdap_technical_implementation_guide_0"]}} | Domain is active |
| hsbt.org | org | org | ICANN | HTTP 200 | 188.114.96.3 | US | {"github":["https://github.com/hsbt"],"facebook":["https://facebook.com/hiroshi.sbt"],"x-twitter":["https://twitter.com/hsbt"]} | 2026-05-13 | C, H2O 2.2.5, HTTP/2, Cloudflare, Google Analytics GA4 | 2026-05-27 | TRUE | {"A":["188.114.96.3","188.114.97.3"],"MX":[{"host":"route1.mx.cloudflare.net","priority":31},{"host":"route2.mx.cloudflare.net","priority":72},{"host":"route3.mx.cloudflare.net","priority":86}],"NS":["patrick.ns.cloudflare.com","walk.ns.cloudflare.com"],"SOA":{"mname":"patrick.ns.cloudflare.com","retry":2400,"rname":"dns.cloudflare.com","expire":604800,"serial":2405071256,"minimum":1800,"refresh":10000},"TXT":["openai-domain-verification=dv-OjF9RdWqHpSK7jZ97u5RyZkE","v=spf1 include:_spf.mx.cloudflare.net ~all"],"AAAA":["2a06:98c1:3120::3","2a06:98c1:3121::3"]} | 0.0000000497269 | 14,140,955 | 2025-08-09 | RDAP | 2004-04-08 | 2027-04-08 | 2025-08-09 | Cloudflare, Inc. | {"raw_response":{"links":[{"rel":"related","href":"https://rdap.cloudflare.com/rdap/v1","type":"application/rdap+json","value":"https://rdap.publicinterestregistry.org/rdap/domain/hsbt.org"},{"rel":"self","href":"https://rdap.publicinterestregistry.org/rdap/domain/hsbt.org","type":"application/rdap+json","value":"https://rdap.publicinterestregistry.org/rdap/domain/hsbt.org"}],"events":[{"eventDate":"2024-07-01T11:52:35.801Z","eventAction":"transfer"},{"eventDate":"2027-04-08T03:12:41.595Z","eventAction":"expiration"},{"eventDate":"2004-04-08T03:12:41.595Z","eventAction":"registration"},{"eventDate":"2024-07-06T11:52:36.036Z","eventAction":"last changed"},{"eventDate":"2025-08-09T11:19:03.47Z","eventAction":"last update of RDAP database"}],"status":["client transfer prohibited"],"ldhName":"hsbt.org","notices":[{"links":[{"rel":"terms-of-service","href":"https://thenew.org/org-people/about-pir/policies/","type":"text/html","value":"https://rdap.publicinterestregistry.org/rdap/domain/hsbt.org"}],"title":"Terms of Service","description":["Public Interest Registry provides this RDAP service for informational purposes only, and to assist persons in obtaining information about or related to a domain name registration record. Public Interest Registry does not guarantee its accuracy. Users accessing the Public Interest Registry RDAP service agree to use the data only for lawful purposes, and under no circumstances may this data be used to: a) allow, enable, or otherwise support the transmission by e-mail, telephone, or facsimile of mass unsolicited, commercial advertising or solicitations to entities other than the registrar's own existing customers and b) enable high volume, automated, electronic processes that send queries or data to the systems of Public Interest Registry or any ICANN-accredited registrar, except as reasonably necessary to register domain names or modify existing registrations. When using the Public Interest Registry RDAP service, please consider the following: the RDAP service is not a replacement for standard EPP commands to the SRS service. RDAP is not considered authoritative for registered domain objects. The RDAP service may be scheduled for downtime during production or OT&E maintenance periods. Queries to the RDAP services are throttled. If too many queries are received from a single IP address within a specified time, the service will begin to reject further queries for a period of time to prevent disruption of RDAP service access. Abuse of the RDAP system through data mining is mitigated by detecting and limiting bulk query access from single sources. Where applicable, the presence of a [Non-Public Data] tag indicates that such data is not made publicly available due to applicable data privacy laws or requirements. Should you wish to contact the registrant, please refer to the RDAP records available through the registrar URL listed above. Access to non-public data may be provided, upon request, where it can be reasonably confirmed that the requester holds a specific legitimate interest and a proper legal basis for accessing the withheld data. Access to this data can be requested by submitting a request to WHOISrequest@pir.org. Public Interest Registry Inc. reserves the right to modify these terms at any time. By submitting this query, you agree to abide by this policy."]},{"links":[{"rel":"glossary","href":"https://icann.org/epp","type":"application/rdap+json","value":"https://icann.org/epp"}],"title":"Status Codes","description":["For more information on domain status codes, please visit https://icann.org/epp"]},{"links":[{"rel":"help","href":"https://icann.org/wicf","type":"application/rdap+json","value":"https://rdap.publicinterestregistry.org/rdap/domain/hsbt.org"}],"title":"RDDS Inaccuracy Complaint Form","description":["URL of the ICANN RDDS Inaccuracy Complaint Form: https://icann.org/wicf"]}],"entities":[{"roles":["registrant"],"events":[{"eventDate":"2025-08-09T11:19:03.47Z","eventAction":"last update of RDAP database"}],"remarks":[{"type":"object redacted due to authorization","title":"REDACTED","description":["Some of the data in this object has been removed."]}],"vcardArray":["vcard",[["version",{},"text","4.0"],["fn",{},"text",""],["adr",{"cc":"JP"},"text",["","","","","Tokyo","",""]]]],"objectClassName":"entity"},{"links":[{"rel":"self","href":"https://rdap.publicinterestregistry.org/rdap/entity/1910","type":"application/rdap+json","value":"https://rdap.publicinterestregistry.org/rdap/entity/1910"},{"rel":"about","href":"https://rdap.cloudflare.com/rdap/v1","type":"application/rdap+json","value":"https://rdap.cloudflare.com/rdap/v1"}],"roles":["registrar"],"handle":"1910","entities":[{"roles":["abuse"],"handle":"1fd953eebe3f4a2180de9de805f5076a-LROR","vcardArray":["vcard",[["version",{},"text","4.0"],["fn",{},"text","Dane Knecht"],["tel",{"type":"voice"},"uri","tel:+1.6503198930"],["email",{},"text","registrar-abuse@cloudflare.com"]]],"objectClassName":"entity"}],"publicIds":[{"type":"IANA Registrar ID","identifier":"1910"}],"vcardArray":["vcard",[["version",{},"text","4.0"],["fn",{},"text","Cloudflare, Inc."]]],"objectClassName":"entity"}],"redacted":[{"name":{"type":"Registry Domain ID"},"method":"removal","prePath":"$.handle","pathLang":"jsonpath"},{"name":{"type":"Registry Registrant ID"},"method":"removal","prePath":"$.entities[?(@.roles[0]=='registrant')].handle","pathLang":"jsonpath"},{"name":{"type":"Registrant Name"},"method":"emptyValue","pathLang":"jsonpath","postPath":"$.entities[?(@.roles[0]=='registrant')].vcardArray[1][?(@[0]=='fn')][3]"},{"name":{"type":"Registrant Street"},"method":"emptyValue","pathLang":"jsonpath","postPath":"$.entities[?(@.roles[0]=='registrant')].vcardArray[1][?(@[0]=='adr')][3][:3]"},{"name":{"type":"Registrant City"},"method":"emptyValue","pathLang":"jsonpath","postPath":"$.entities[?(@.roles[0]=='registrant')].vcardArray[1][?(@[0]=='adr')][3][3]"},{"name":{"type":"Registrant Postal Code"},"method":"emptyValue","pathLang":"jsonpath","postPath":"$.entities[?(@.roles[0]=='registrant')].vcardArray[1][?(@[0]=='adr')][3][5]"},{"name":{"type":"Registrant Phone"},"method":"removal","prePath":"$.entities[?(@.roles[0]=='registrant')].vcardArray[1][?(@[1].type=='voice')]","pathLang":"jsonpath"},{"name":{"type":"Registrant Email"},"method":"removal","prePath":"$.entities[?(@.roles[0]=='registrant')].vcardArray[1][?(@[0]=='email')]","pathLang":"jsonpath"},{"name":{"description":"Technical Contact"},"method":"removal"},{"name":{"description":"Administrative Contact"},"method":"removal"}],"publicIds":[{"type":"IANA Registrar ID","identifier":"1910"}],"secureDNS":{"dsData":[{"digest":"5F0902E8BFC1408ED09E77F9DE0316285B4A99348BCFA7F7B91BD013CEDACD55","keyTag":2371,"algorithm":13,"digestType":2}],"maxSigLife":1,"delegationSigned":true},"nameservers":[{"handle":"47f4ff5408d14a0080738f8a7914e7a0-LROR","status":["associated"],"ldhName":"patrick.ns.cloudflare.com","unicodeName":"patrick.ns.cloudflare.com","objectClassName":"nameserver"},{"handle":"64d6a158e8ce46a8b8c16a004fb3be31-LROR","status":["associated"],"ldhName":"walk.ns.cloudflare.com","unicodeName":"walk.ns.cloudflare.com","objectClassName":"nameserver"}],"unicodeName":"hsbt.org","objectClassName":"domain","rdapConformance":["rdap_level_0","icann_rdap_response_profile_1","icann_rdap_technical_implementation_guide_1","redacted"]}} | Domain is active |
| katsyoshi.org | org | org | ICANN | HTTP 200 | 202.181.103.221 | JP | {"x-twitter":["https://twitter.com/katsyoshi"]} | 2026-05-16 | C, H2O 2.2.5, PWA, HTTP/2, Cloudflare, Font Awesome, Google AdSense, Google Workspace | 2026-05-29 | TRUE | {"A":["202.181.103.221"],"MX":[{"host":"alt1.aspmx.l.google.com","priority":5},{"host":"alt2.aspmx.l.google.com","priority":5},{"host":"aspmx.l.google.com","priority":1},{"host":"aspmx2.googlemail.com","priority":10},{"host":"aspmx3.googlemail.com","priority":10}],"NS":["amy.ns.cloudflare.com","earl.ns.cloudflare.com"],"SOA":{"mname":"amy.ns.cloudflare.com","retry":2400,"rname":"dns.cloudflare.com","expire":604800,"serial":2405500152,"minimum":1800,"refresh":10000},"TXT":["google-site-verification=4qfWs7NxiZ_7EmKuQk6ED3vg0-SfFvDevzJEcqlXZ3M","v=spf1 include:_spf.google.com ~all"],"AAAA":["2001:e42:102:1101:202:181:103:221"]} | 0.0000000213001 | 13,664,434 | 2026-05-16 | RDAP | 2011-05-25 | 2027-05-25 | 2026-04-30 | Cloudflare, Inc. | {"raw_response":{"links":[{"rel":"related","href":"https://rdap.cloudflare.com/rdap/v1/domain/katsyoshi.org","type":"application/rdap+json","value":"https://rdap.publicinterestregistry.org/rdap/domain/katsyoshi.org"},{"rel":"self","href":"https://rdap.publicinterestregistry.org/rdap/domain/katsyoshi.org","type":"application/rdap+json","value":"https://rdap.publicinterestregistry.org/rdap/domain/katsyoshi.org"}],"events":[{"eventDate":"2022-10-13T01:41:21.599Z","eventAction":"transfer"},{"eventDate":"2027-05-25T15:30:15Z","eventAction":"expiration"},{"eventDate":"2011-05-25T15:30:15Z","eventAction":"registration"},{"eventDate":"2026-04-30T04:05:52.694Z","eventAction":"last changed"},{"eventDate":"2026-05-16T02:18:58.944Z","eventAction":"last update of RDAP database"}],"status":["client transfer prohibited"],"ldhName":"katsyoshi.org","notices":[{"links":[{"rel":"terms-of-service","href":"https://thenew.org/org-people/about-pir/policies/","type":"text/html","value":"https://rdap.publicinterestregistry.org/rdap/domain/katsyoshi.org"}],"title":"Terms of Service","description":["Public Interest Registry provides this RDAP service for informational purposes only, and to assist persons in obtaining information about or related to a domain name registration record. 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The RDAP service may be scheduled for downtime during production or OT&E maintenance periods. Queries to the RDAP services are throttled. If too many queries are received from a single IP address within a specified time, the service will begin to reject further queries for a period of time to prevent disruption of RDAP service access. Abuse of the RDAP system through data mining is mitigated by detecting and limiting bulk query access from single sources. Where applicable, the presence of a [Non-Public Data] tag indicates that such data is not made publicly available due to applicable data privacy laws or requirements. Should you wish to contact the registrant, please refer to the RDAP records available through the registrar URL listed above. Access to non-public data may be provided, upon request, where it can be reasonably confirmed that the requester holds a specific legitimate interest and a proper legal basis for accessing the withheld data. Access to this data can be requested by submitting a request to WHOISrequest@pir.org. Public Interest Registry Inc. reserves the right to modify these terms at any time. By submitting this query, you agree to abide by this policy."]},{"links":[{"rel":"glossary","href":"https://icann.org/epp","type":"application/rdap+json","value":"https://rdap.publicinterestregistry.org/rdap/domain/katsyoshi.org"}],"title":"Status Codes","description":["For more information on domain status codes, please visit https://icann.org/epp"]},{"links":[{"rel":"help","href":"https://icann.org/wicf","type":"application/rdap+json","value":"https://rdap.publicinterestregistry.org/rdap/domain/katsyoshi.org"}],"title":"RDDS Inaccuracy Complaint Form","description":["URL of the ICANN RDDS Inaccuracy Complaint Form: https://icann.org/wicf"]}],"entities":[{"links":[{"rel":"self","href":"https://rdap.publicinterestregistry.org/rdap/entity/1910","type":"application/rdap+json","value":"https://rdap.publicinterestregistry.org/rdap/entity/1910"},{"rel":"about","href":"https://rdap.cloudflare.com/rdap/v1","type":"application/rdap+json","value":"https://rdap.cloudflare.com/rdap/v1"}],"roles":["registrar"],"handle":"1910","entities":[{"roles":["abuse"],"vcardArray":["vcard",[["version",{},"text","4.0"],["fn",{},"text",""],["tel",{"type":"voice"},"uri","tel:+1.6503198930"],["email",{},"text","registrar-abuse@cloudflare.com"]]],"objectClassName":"entity"}],"publicIds":[{"type":"IANA Registrar ID","identifier":"1910"}],"vcardArray":["vcard",[["version",{},"text","4.0"],["fn",{},"text","Cloudflare, Inc."]]],"objectClassName":"entity"}],"redacted":[{"name":{"type":"Registry Domain ID"},"method":"removal","prePath":"$.handle","pathLang":"jsonpath"}],"secureDNS":{"dsData":[{"digest":"89CA4D3DEB144FBDE2649E89206E0587E54AF27C28807E5B67009901E448CEB9","keyTag":2371,"algorithm":13,"digestType":2}],"maxSigLife":1,"delegationSigned":true},"nameservers":[{"handle":"f706efc2619d459393354d63b0cde4ca-LROR","status":["associated"],"ldhName":"amy.ns.cloudflare.com","unicodeName":"amy.ns.cloudflare.com","objectClassName":"nameserver"},{"handle":"b51785762eac4a71a43355341ba7746b-LROR","status":["associated"],"ldhName":"earl.ns.cloudflare.com","unicodeName":"earl.ns.cloudflare.com","objectClassName":"nameserver"}],"unicodeName":"katsyoshi.org","objectClassName":"domain","rdapConformance":["rdap_level_0","icann_rdap_response_profile_1","icann_rdap_technical_implementation_guide_1","redacted"]}} | Domain is active |
| irori.org | org | org | ICANN | HTTP 200 | 111.89.165.55 | JP | {"github":["http://github.com/hirose31"]} | 2026-05-15 | C, H2O 2.3.0, HSTS, HTTP/2, HTTP/3 | 2026-06-01 | TRUE | {"A":["111.89.165.55"],"MX":[{"host":"smtp10.irori.org","priority":0}],"NS":["ns11.irori.org","ns50.irori.org"],"SOA":{"mname":"ns11.irori.org","retry":2048,"rname":"hostmaster.irori.org","expire":1048576,"serial":1706090217,"minimum":2560,"refresh":16384},"TXT":["v=spf1 a mx ~all"]} | 0.0000000169218 | 13,045,422 | 2026-01-08 | RDAP | 2000-02-06 | 2027-02-06 | 2026-01-08 | GMO Internet Group, Inc. d/b/a Onamae.com | {"raw_response":{"links":[{"rel":"related","href":"https://rdap.gmo-onamae.com/rdap/v1/domain/irori.org","type":"application/rdap+json","value":"https://rdap.publicinterestregistry.org/rdap/domain/irori.org"},{"rel":"self","href":"https://rdap.publicinterestregistry.org/rdap/domain/irori.org","type":"application/rdap+json","value":"https://rdap.publicinterestregistry.org/rdap/domain/irori.org"}],"events":[{"eventDate":"2012-12-14T11:40:53.204Z","eventAction":"transfer"},{"eventDate":"2027-02-06T13:26:15Z","eventAction":"expiration"},{"eventDate":"2000-02-06T13:26:16.204Z","eventAction":"registration"},{"eventDate":"2026-01-06T23:18:43.446Z","eventAction":"last changed"},{"eventDate":"2026-01-08T05:33:58.476Z","eventAction":"last update of RDAP database"}],"status":["client transfer prohibited","renew period"],"ldhName":"irori.org","notices":[{"links":[{"rel":"terms-of-service","href":"https://thenew.org/org-people/about-pir/policies/","type":"text/html","value":"https://rdap.publicinterestregistry.org/rdap/domain/irori.org"}],"title":"Terms of Service","description":["Public Interest Registry provides this RDAP service for informational purposes only, and to assist persons in obtaining information about or related to a domain name registration record. 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The RDAP service may be scheduled for downtime during production or OT&E maintenance periods. Queries to the RDAP services are throttled. If too many queries are received from a single IP address within a specified time, the service will begin to reject further queries for a period of time to prevent disruption of RDAP service access. Abuse of the RDAP system through data mining is mitigated by detecting and limiting bulk query access from single sources. Where applicable, the presence of a [Non-Public Data] tag indicates that such data is not made publicly available due to applicable data privacy laws or requirements. Should you wish to contact the registrant, please refer to the RDAP records available through the registrar URL listed above. Access to non-public data may be provided, upon request, where it can be reasonably confirmed that the requester holds a specific legitimate interest and a proper legal basis for accessing the withheld data. 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Showing 5 of 373 rows · Technologies · Full website tech stack per site — CMS, payments, analytics, frameworks.
+ 4 datasets don't carry the Technologies column.
Version distribution
Detected H2O versions across all 373 sites.
| Version | Sites | Share |
|---|---|---|
| 2.3.0 | 265 | 89.8% |
| 2.2.5 | 15 | 5.1% |
| 2.2.6 | 9 | 3.0% |
| 2.2.3 | 2 | 0.7% |
| 2.2.0 | 1 | 0.3% |
| 2.2.4 | 1 | 0.3% |
| 114.514 | 1 | 0.3% |
| 2.1.0 | 1 | 0.3% |
The H2O dataset
Every site we've detected as running H2O — with version, hosting, country, TLD and traffic rank.
H2O lives inside 2 datasets
H2O detection is part of Technologies (€159/mo) and All data (€599/mo). Buy either to filter the full 373-site list — or grab a free preview first.
Frequently asked questions
How many websites use H2O?
webatla detects H2O on 373 websites, refreshed daily — each with its domain, DNS, WHOIS, IP, country and ranking.
Can I download the list of websites using H2O?
Yes — as structured JSONL. Pay once for one month, no subscription; grab a free sample first.
What's included for each site, and how fresh is it?
Domain, DNS, RDAP/WHOIS, the full technology stack, IP & country, PageRank and Harmonic — re-detected and re-exported daily.
Related technologies