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DNS over...

DNS over IRC

IRC carries hostname and IP mappings that a local cache and libc Name Service Switch use to resolve names without publishing them through DNS.

IRCname resolutionlibc Name Service Switch

Date updated:

Screenshot used in the talk for DNS over IRC
Screenshot used in the original talk. Select the image to view it full size.

This design exchanges hostname and IP mappings over IRC. A local cache and libc Name Service Switch make those mappings available to local applications as name-resolution results.

It is unusual because it uses a chat network for name resolution without sending DNS update requests or publishing the mappings in normal DNS.

Primary source: https://purpleidea.com/blog/2020/09/01/inexpensive-dns-over-irc/