InspIRCd review 2026: explore this free, open-source, modular IRCv3 server, its C++ architecture, module system, self-hosting requirements and alternatives.
InspIRCd is a free, open-source IRC server (IRCd) written from scratch in C++, originally developed by Craig Edwards, Craig McLure, and Robin Burchell starting around 2002 as an alternative to the aging codebases of established IRC daemons. Rather than forking an existing server, the team built InspIRCd as a clean implementation, which let them design a modular architecture and avoid inherited technical debt from earlier projects like ircd-hybrid or the Unreal lineage.
The project has no corporate owner; it is licensed under the GNU General Public License v2 and maintained by the InspIRCd Contributors community on GitHub, with a public, structured release cadence that has continued for over two decades, including the current 4.x stable series.
InspIRCd runs on Linux, BSD, Windows, and macOS, and is used to power more than 1,000 IRC networks worldwide, including community networks such as Snoonet and Teranova, making it one of the most widely deployed independent IRCd implementations alongside UnrealIRCd and the charybdis/solanum family used by large public networks.
InspIRCd's core design principle is modularity: server operators compile or load only the modules they need, keeping deployments lightweight and reducing attack surface compared to monolithic IRCd designs. It supports SSL/TLS via both GnuTLS and OpenSSL, WebSocket connections for browser-based IRC clients, and the HAProxy PROXY protocol for operators running the server behind a load balancer or reverse proxy.
Security and authentication features include bcrypt and PBKDF2 password hashing, abstract operator classes with granular, per-role permissions, a regular-expression-based spam filter, and UNIX socket support for local connections. On the protocol side, InspIRCd implements all ratified IRCv3 specifications and WHOX, keeping it compatible with modern IRC clients and bouncers.
Performance-oriented features such as Linux epoll and FreeBSD kqueue support allow a single InspIRCd instance to handle a very large number of simultaneous connections efficiently, which is why it is a common choice for mid-size to large community and gaming-adjacent IRC networks that need to scale beyond a few hundred concurrent users.
InspIRCd is entirely free and open source under the GPLv2 license, with no paid tiers, subscriptions, or usage limits imposed by the project itself. Because it is self-hosted server software rather than a SaaS product, the only real cost is the infrastructure an operator chooses to run it on, whether that is a small home server, a VPS, or a dedicated box for a large public network.
There is no official commercial support contract sold by the InspIRCd project; operators rely on public documentation, the community IRC channel, and the GitHub issue tracker for help, which is typical of volunteer-maintained open-source infrastructure software rather than venture-backed SaaS products.
Yes. InspIRCd is completely free and open source under the GNU General Public License v2, with no paid tiers or subscription costs.
InspIRCd runs on Linux, BSD, Windows, and macOS, which is broader platform coverage than most other IRCd projects offer.
InspIRCd is maintained by the InspIRCd Contributors, a volunteer open-source community, with development tracing back to around 2002 when it was started by Craig Edwards, Craig McLure, and Robin Burchell.
Yes. InspIRCd implements all ratified IRCv3 specifications along with WebSocket support, making it compatible with modern IRC clients and browser-based chat interfaces.
InspIRCd was written entirely from scratch in C++ rather than evolving from an older codebase, giving it a more modular architecture, while UnrealIRCd has a longer history dating to 1999 with its own large user base.
Yes. InspIRCd is self-hosted server software; there is no official managed or SaaS hosting option from the project itself, though many VPS providers can run it.