The Public Suffix List
A "public suffix" is one under which Internet users can (or historically could) directly register names. Some examples of public suffixes are .com, .co.uk and pvt.k12.ma.us. The Public Suffix List is a list of all known public suffixes.
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All submissions must conform to the validation and acceptance factors and provide sufficient rationale or basically be as complete as possible. The list is maintained by people volunteering their time. Iteration back and forth will delay PR review or inclusion.
Important Notice: 2021-04-23 : Did guidance related to an issue with Facebook or Apple bring you here? Read this before submitting requests We are not approving workaround requests per the validation and acceptance standards, but do have open discussion with Facebook on the matter.