Download websites that use Resin

About Resin

Caucho Technology built Resin for a moment when a company's decision about a Java container was expected to last the better part of a decade. Released in 1999 and offered under GPL v2 for its community edition alongside a commercial one, Resin competed by starting quickly and staying modest with memory at a time when the large enterprise stacks did neither. The pitch worked well enough that Resin ended up underneath a generation of Java applications built for internal business processes, university systems, and product back ends that were never meant to be rewritten.

As of October 2026 we detect Resin on 197 sites, and the interesting property of that population is not its size but its age. Our records carry 43 distinct version strings for Resin, and the one we see most often is 3.0.24. A version fingerprint that old does not describe a platform under active development. Resin deployments are usually stable by design, sitting behind a reverse proxy and serving an application whose owners measure success by uptime rather than by release cadence.

The shape of that population is what makes the list commercially useful. Teams selling Java modernisation, container migration, or application replatforming work from exactly this signal, because a site running an old container is a site with a budget question that has been deferred rather than answered. Security researchers care for a related reason, since an unattended application server is where unpatched dependencies quietly accumulate. Hosting providers and managed service firms read the same list in reverse, as a set of workloads they could take over.

Where Resin turns up says as much as the version does. An application server is not something a shared host provisions for a customer, so a detection usually implies dedicated or self-managed infrastructure, an operations team of some description, and a front end web server or load balancer terminating traffic ahead of it. The co-occurring technologies on the same site are often the more valuable field, because they show whether the container was left alone with everything else or whether it is the last old component in a stack that has otherwise been renewed.

Server software detection deserves a plain caveat. Resin is identified from the traces it leaves in responses, and any operator who suppresses server banners or terminates traffic at a proxy that rewrites headers drops out of our count. Version information is even more conditional, which is why the version strings we hold should be read as the versions we could see rather than the versions that exist. Our figure is a floor, and for legacy infrastructure the distance between the floor and reality is usually wide.

A per-domain lookup answers one question at a time, whether a single site runs Resin. The question researchers actually bring is different: which sites, in which markets and under which top level domains, still run it, and which of them pair it with a database, a front end, or a hosting provider you already sell against. Our downloadable Web servers data answers the second question by handing over the whole detected population in one file, filterable and joinable against an account list, which is the only form in which an aging platform becomes a market rather than an anecdote.