For several years, Mozilla has maintained the Public Suffix List, a “map” of responsibilities within the DNS, as a service to the greater Internet community. We originally created it for browsers, but it has seen wider use in a surprising variety of places. There is now renewed interest in replacing it with something DNS-based and more robust. As a precursor to that work, I’m collecting a list of all the things the PSL is used for.
If you are a Mozilla hacker and know of somewhere we are using the PSL that isn’t listed, or if you know of uses of the PSL outside Mozilla, please add them.