Public Suffix List

The Public Suffix List (PSL) is a community-maintained list of rules that describes the internet domain name suffixes under which independent organisations can register their own sites. Entries on the list are referred to as effective top-level domains (eTLDs), and contain commonly used suffixes like com, net and co.uk, as well as private suffixes like appspot.com and github.io.

The Mozilla Foundation created the PSL for the security and privacy policies of the Firefox web browser, but it is widely used in many different internet technologies with varying success, under the Mozilla Public License (MPL). The list has been shown to have numerous issues to do with privacy and security, mostly caused by applications using outdated versions.

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