Webirc
How webirc works:
- The user opens a mibbit client and requests a connect to, e.g., irc.blah.com
- The Mibbit backend checks irc.blah.com for matches in mibbit's webirc database
- If found the backend sends the user's IP along with a password (chosen by the server admin) to irc.blah.com
- The server checks all requests from 64.62.228.82 (webchat.mibbit.com) or Template:Mibbit WIDGET IP (widget.mibbit.com) for password match and converts ident to "Mibbit" and host to the user's host (most networks obfuscate the host for non ircops) and allows an (almost) unlimited number of users from mibbit's IP