--- title: "Download list of all Underscore.js sites" description: "Every website running Underscore.js, with domain, DNS, WHOIS, IP address, hosting country and global rank on each row. One file, rebuilt daily." url: https://webatla.com/technology/underscore-js --- [Home](https://webatla.com/) › [Technologies](https://webatla.com/technology) › [JavaScript libraries](https://webatla.com/technology?category=JavaScript%20libraries) › Underscore.js ![Underscore.js logo](https://webatla.com/assets/tech-logos/underscore-js.png) # Download websites that use Underscore.js 2,058,060 live sites using Underscore.js right now JavaScript libraries · since 2009 · open source 2.1M sites, Dataset updated · 2026-10-27 Categories [JavaScript libraries](https://webatla.com/technology?category=JavaScript%20libraries) [🔒 Get the list](https://webatla.com/technology/underscore-js#preview) Requires a dataset purchase [About Underscore.js](https://webatla.com/technology/underscore-js#overview) [Database preview](https://webatla.com/technology/underscore-js#preview) [By country](https://webatla.com/technology/underscore-js#by-country) [By TLD](https://webatla.com/technology/underscore-js#by-tld) [Versions](https://webatla.com/technology/underscore-js#versions) [Download](https://webatla.com/technology/underscore-js#download) All figures as of Oct 27, 2026 All figures here come from one snapshot of the webatla database, taken on this date (UTC). We usually refresh it every day. 2,058,060, Sites detected 0.7%, Of all websites 1.13.8, Most used version ## Preview Underscore.js site datasets Underscore.js detection is a value inside the **Technologies** column. Two datasets carry it. **Technologies · €159 / month · 2,058,060 rows · 14 columns · webatla-technologies-underscore-js-2026-10-27.jsonl.zst** | 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 | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | cnil.fr | [fr](https://webatla.com/tld/fr) | [fr](https://webatla.com/tld/fr) | ICANN | HTTP 200 | 104.20.39.48 | [US](https://webatla.com/country/us) | {…} | 2026-10-11 | PHP, HSTS, Slick, Drupal 10 , HTTP/2, jQuery, Favicon, Sectigo, Varnish 7.1 , Bootstrap 5 | 0.0000859481 | 19,892,436 | 1997-10-28 | 2027-04-18 | | jedfoundation.org | [org](https://webatla.com/tld/org) | [org](https://webatla.com/tld/org) | ICANN | HTTP 200 | 141.193.213.20 | [US](https://webatla.com/country/us) | {…} | 2026-10-19 | Google Analytics G-CRMMZMD5GB G-YH5SG2CFKM UA-1039942-1 UA-3524656-1 UA-3524656-10 UA-3524656-2 UA-3524656-9 UA-86805609-1 +7 , Google Tag Manager GTM-T5H6JD7 , PHP, RSS, Canva, Figma, MySQL… | 0.0000326526 | 18,507,648 | 2000-10-12 | 2027-10-12 | | kidshelpphone.ca | [ca](https://webatla.com/tld/ca) | [ca](https://webatla.com/tld/ca) | ICANN | HTTP 200 | 141.193.213.20 | [US](https://webatla.com/country/us) | {…} | 2026-10-20 | Google Analytics G-6ZP0WX1XYV G-TQY135CFXS UA-91546566-1 UA-91546566-2 +3 , Google Tag Manager GTM-T626G3P , DoubleClick Floodlight DC-9977561 , PHP, RSS, HSTS, Miro, MySQL, Unpkg, HTTP/3 | 0.0000305749 | 18,397,774 | 2002-09-18 | 2027-09-18 | | parentzone.org.uk | [org.uk](https://webatla.com/tld/uk) | [uk](https://webatla.com/tld/uk) | ICANN | HTTP 200 | 88.208.197.205 | [GB](https://webatla.com/country/gb) | {…} | 2026-10-11 | Google Analytics G-P813LN68ZT , Google Tag Manager GTM-KLK4H86 , PHP 8.3.35 , RSS, IONOS, Nginx, Plesk, Drupal 10 , HTTP/2, jQuery | 0.0000294068 | 18,313,534 | 2011-08-12 | 2027-08-12 | | adweek.com | [com](https://webatla.com/tld/com) | [com](https://webatla.com/tld/com) | ICANN | HTTP 200 | 192.0.66.74 | [US](https://webatla.com/country/us) | {…} | 2026-09-26 | Google Analytics G-3JLEQTPRR2 G-B4LNRCV4BR UA-12174401-1 UA-21937547-1 UA-21937547-16 UA-21937547-17 UA-34138128-8 +6 , Google Tag Manager GTM-KRKWMZT GTM-KX5FCW +1 , PHP, PWA, MySQL, Slick… | 0.000028616 | 18,982,410 | 1995-05-25 | 2027-05-24 | **All data · €599 / month · 2,058,060 rows · 23 columns · webatla-all-data-underscore-js-2026-10-27.jsonl.zst** | 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 | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | cnil.fr | [fr](https://webatla.com/tld/fr) | [fr](https://webatla.com/tld/fr) | ICANN | HTTP 200 | 104.20.39.48 | [US](https://webatla.com/country/us) | {…} | 2026-10-11 | PHP, HSTS, Slick, Drupal 10 , HTTP/2, jQuery, Favicon, Sectigo, Varnish 7.1 , Bootstrap 5 | 2026-10-18 | TRUE | {…} | 0.0000859481 | 19,892,436 | 2026-04-26 | RDAP | 1997-10-28 | 2027-04-18 | 2026-04-18 | DIGITAL RURAL INFORMATIQUE | {…} | Domain is active | | jedfoundation.org | [org](https://webatla.com/tld/org) | [org](https://webatla.com/tld/org) | ICANN | HTTP 200 | 141.193.213.20 | [US](https://webatla.com/country/us) | {…} | 2026-10-19 | Google Analytics G-CRMMZMD5GB G-YH5SG2CFKM UA-1039942-1 UA-3524656-1 UA-3524656-10 UA-3524656-2 UA-3524656-9 UA-86805609-1 +7 , Google Tag Manager GTM-T5H6JD7 , PHP, RSS, Canva, Figma, MySQL… | 2026-10-17 | TRUE | {…} | 0.0000326526 | 18,507,648 | 2026-10-22 | RDAP | 2000-10-12 | 2027-10-12 | 2026-10-13 | GoDaddy.com, LLC | {…} | Domain is active | | kidshelpphone.ca | [ca](https://webatla.com/tld/ca) | [ca](https://webatla.com/tld/ca) | ICANN | HTTP 200 | 141.193.213.20 | [US](https://webatla.com/country/us) | {…} | 2026-10-20 | Google Analytics G-6ZP0WX1XYV G-TQY135CFXS UA-91546566-1 UA-91546566-2 +3 , Google Tag Manager GTM-T626G3P , DoubleClick Floodlight DC-9977561 , PHP, RSS, HSTS, Miro, MySQL, Unpkg, HTTP/3 | 2026-10-14 | TRUE | {…} | 0.0000305749 | 18,397,774 | 2026-09-17 | RDAP | 2002-09-18 | 2027-09-18 | 2026-09-04 | Webnames.ca Inc. | {…} | Domain is active | | parentzone.org.uk | [org.uk](https://webatla.com/tld/uk) | [uk](https://webatla.com/tld/uk) | ICANN | HTTP 200 | 88.208.197.205 | [GB](https://webatla.com/country/gb) | {…} | 2026-10-11 | Google Analytics G-P813LN68ZT , Google Tag Manager GTM-KLK4H86 , PHP 8.3.35 , RSS, IONOS, Nginx, Plesk, Drupal 10 , HTTP/2, jQuery | 2026-10-14 | TRUE | {…} | 0.0000294068 | 18,313,534 | 2026-08-22 | RDAP | 2011-08-12 | 2027-08-12 | 2026-08-11 | Ionos SE | {…} | Domain is active | | adweek.com | [com](https://webatla.com/tld/com) | [com](https://webatla.com/tld/com) | ICANN | HTTP 200 | 192.0.66.74 | [US](https://webatla.com/country/us) | {…} | 2026-09-26 | Google Analytics G-3JLEQTPRR2 G-B4LNRCV4BR UA-12174401-1 UA-21937547-1 UA-21937547-16 UA-21937547-17 UA-34138128-8 +6 , Google Tag Manager GTM-KRKWMZT GTM-KX5FCW +1 , PHP, PWA, MySQL, Slick… | 2026-10-22 | TRUE | {…} | 0.000028616 | 18,982,410 | 2026-05-23 | RDAP | 1995-05-25 | 2027-05-24 | 2026-05-19 | Moniker Online Services LLC | {…} | Domain is active | [↓ Download preview (20 rows, free)](https://webatla.com/api/v1/sample/technology/underscore-js?dataset=technologies) [Buy Technologies · €159 / month](https://webatla.com/account/checkout?dataset=technologies) ## Underscore.js sites by country | Country | Sites | Share | | --- | --- | --- | | 🇺🇸 [United States](https://webatla.com/country/us) | 744,941 | 37.1% | | 🇩🇪 [Germany](https://webatla.com/country/de) | 352,288 | 17.6% | | 🇫🇷 [France](https://webatla.com/country/fr) | 99,059 | 4.9% | | 🇨🇾 [Cyprus](https://webatla.com/country/cy) | 64,194 | 3.2% | | 🇮🇷 [Iran](https://webatla.com/country/ir) | 60,605 | 3.0% | ## Underscore.js sites by TLD | TLD | Sites | Share | | --- | --- | --- | | [.com](https://webatla.com/tld/com) | 949,806 | 46.2% | | [.de](https://webatla.com/tld/de) | 100,889 | 4.9% | | [.org](https://webatla.com/tld/org) | 80,451 | 3.9% | | [.uk](https://webatla.com/tld/uk) | 57,801 | 2.8% | | [.br](https://webatla.com/tld/br) | 53,356 | 2.6% | ## Version distribution Detected Underscore.js versions across all 2,058,060 sites. | Version | Sites | Share | | --- | --- | --- | | **1.13.8** | 1,169,150 | 65.0% | | 1.13.7 | 374,712 | 20.8% | | 1.13.4 | 149,625 | 8.3% | | 1.8.3 | 56,977 | 3.2% | | 1.13.1 | 21,727 | 1.2% | ## The Underscore.js dataset Every site we've detected as running Underscore.js, with version, hosting, country, TLD and traffic rank. ### Underscore.js lives inside 2 datasets Underscore.js detection is part of **Technologies** (€159/mo) and **All data** (€599/mo). Buy either to filter the full 2,058,060-site list, or grab a free preview first. [See datasets](https://webatla.com/pricing) [↓ Download free preview (20 rows)](https://webatla.com/api/v1/sample/technology/underscore-js?dataset=technologies) ## About Underscore.js ### At a glance - **Website:** underscorejs.org ↗ - **Language:** JavaScript - **License:** MIT - **First release:** 2009-10-01 There is a category of software that nobody installs any more and that keeps turning up anyway. Underscore.js is a clean example of it. Released in 2009, the library supplied the array, object and function helpers that the language itself did not have, and for years few serious codebases went without one of them. JavaScript then absorbed most of the ideas into the standard. A developer starting a project today has no reason to add it, and we keep finding it regardless. The explanation is that it usually arrives as luggage. A charting widget, an old admin theme, a marketing tag or a bundled plugin brings the library along, and the site owner never chose it and does not know it is present. As of October 2026 we detect it on 2,058,060 sites, and the figure should be read as a measure of what the web has accumulated rather than of what anyone is currently adopting. Understood that way, presence becomes a dating tool. A domain serving this library is likely to be serving other code from the same period, because bundles rarely age alone. The library is small, MIT licensed and harmless in itself, so a finding is not a vulnerability report and we will not dress it up as one. A finding is an indication that a page's JavaScript has layers, that some of those layers are old, and that nobody has audited the bottom of the stack in a long time. The version picture is unusually wide for a library this stable. We record 1,165 distinct version strings, and the release we see most often is 1.13.8. The spread comes from the delivery model rather than from churn. Copies sit inside other people's bundles, pinned to whatever was current when that bundle was built, and they move only when the parent product moves. Version detection is also partial, because a minified copy concatenated into a larger file often carries no readable marker, which means a share of installs appear in the count with no release attached. United States accounts for 744,941 of the sites where we find it, and .com carries the bulk of the domain mix. The audience for a list like this is not developers shopping for a utility library. Supply chain and application security teams want to know where old client-side code physically sits across a portfolio. Performance vendors want sites still shipping helper code that duplicates the language. Agencies and platform migrators want evidence, in a form a client will accept, that a site rests on foundations laid a long time ago. Researchers studying how dependencies decay want the population itself and its movement between snapshots. One domain can be checked by hand in a browser console, and for one domain that is the right tool. The value of the download is in the shape of the population instead. Which hosts, which countries, which co-occurring platforms, which sites carry the library together with an equally old jQuery, and how many of them fall out of the list from one snapshot to the next. Answering any of that from lookups would mean guessing the domain list first, and guessing the domain list is exactly the work the dataset exists to remove. ## Frequently asked questions How many websites use Underscore.js? webatla detects Underscore.js on 2.1M websites, refreshed daily, each with its domain, DNS, WHOIS, IP, country and ranking. Can I download the list of websites using Underscore.js? Yes, as structured JSONL. 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. How do I find the websites using Underscore.js? Buy the technology dataset, then download the complete list of domains we detect using Underscore.js, re-exported every day. What else is in the Underscore.js technology data? Each row places Underscore.js next to the other technology on the same site, plus DNS, WHOIS, IP, country and ranking. Can I download just the sites using Underscore.js, or the whole database? Both. Every site running Underscore.js comes in the Technologies dataset, one downloadable file. Or buy All data for the entire database: technologies plus identity, ranking, DNS and RDAP/WHOIS for every domain, combined in one file. Daily fresh export. How do I download the list of websites using Underscore.js? Three steps: (1) grab the free 10,000-row sample to inspect the schema, (2) buy the Technologies dataset, (3) download the full list of every domain we detect running Underscore.js as a JSON Lines file. It is re-exported daily, so you can re-download the freshest list any time inside your access window. Each row carries the domain plus DNS, WHOIS, IP, hosting country and rank. ## Get the full list of websites using Underscore.js Pick the dataset that covers what you need. Each one includes Underscore.js and downloads as JSONL, rebuilt daily. Technologies, 14 columns Full website tech stack per site: CMS, payments, analytics, frameworks. €159 / mo [Buy and download](https://webatla.com/account/checkout?dataset=technologies) [Download preview dataset](https://webatla.com/api/v1/preview?dataset=technologies) All data, 23 columns Everything we have, in a single package. The full webatla universe. €599 / mo [Buy and download](https://webatla.com/account/checkout?dataset=all-data) [Download preview dataset](https://webatla.com/api/v1/preview?dataset=all-data) Want to compare every dataset side by side? [Visit the pricing page](https://webatla.com/pricing) ## Related technologies [![jQuery logo](https://webatla.com/assets/tech-logos/jquery.png) jQuery JavaScript Library · 38.7M sites](https://webatla.com/technology/jquery) [![core-js logo](https://webatla.com/assets/tech-logos/core-js.png) core-js JavaScript Library · 21.3M sites](https://webatla.com/technology/core-js) [![jQuery Migrate logo](https://webatla.com/assets/tech-logos/jquery-migrate.png) jQuery Migrate JavaScript Library · 16.8M sites](https://webatla.com/technology/jquery-migrate) [![Swiper logo](https://webatla.com/assets/tech-logos/swiper.png) Swiper JavaScript Library · 4.5M sites](https://webatla.com/technology/swiper)