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. All submissions must conform to the validation and acceptance factors, provide sufficient rationale, and be as complete as possible, following the Guidelines, especially as they relate to format and sorting. The list is currently maintained by people who are volunteering their time towards universal acceptance and ensuring there is a bridge between the ICANN world of domain names and the crucial last mile - the world of developers and human users. Iteration back and forth will delay PR review or inclusion. Be extremely thorough and patient. 2026-05-06 Pull Requests MUST use the automated template when adding. Do not cut and paste it into a GPT to generate a response or delete / alter the form. Pull requests that do not use the template, that alter it or summarize it will be closed by volunteers without action. Why? There are specific checkboxes that are part of the volunteers' review or are important attestations for public record and transparency and consistency of processing. Consult Cloudflare's subdomain setup documentation or contact Cloudflare directly for subdomain setup questions. Only submit a request to the PSL if your domain truly meets our criteria outlined in Guidelines. 2024-07-26 We are sending emails asking for confirmation if certain entries are still required or need updating. Currently, this process is purely manual and extremely low volume, but if you do get an email, please respond. Please see the Email Communication Policy to see how we will often communicate these changes. 2023-02-20 Did guidance from Google related to the changes that they are making to AdSense subdomains bring you here? Work with Google AdSense Help Link with any support questions you have. The PSL is thinly resourced, and the volunteer maintainers are unable to answer questions about Adsense changes or support Adsense. 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 we do have open discussions with Facebook on the matter. We tend to use the subject line tag "[PSL notification]" in all Public Suffix List communications. For effective spam filtering, you can create a case-insensitive filter to allow only emails with the exact "[PSL notification]" in the subject line. If you choose to set up such a filter in your email application, please verify the filter is implemented correctly and test it thoroughly to ensure you don't accidentally miss important communications from us. Your participation in the Public Suffix List project should follow the Mozilla Community Participation Guidelines as well as the GitHub Community Participation Guidelines. Behavior that falls into the areas forbidden by either document is unwelcome and will result in further escalation.