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The Public Suffix List is a cross-vendor initiative to provide an accurate list of domain name suffixes, maintained by the hard work of Mozilla volunteers and by submissions from registries, to whom we are very grateful. The usefulness of this can be seen if we take the example of cookies. In the past, browsers used an algorithm which only denied setting wide-ranging cookies for top-level domains

The list is kept in source code control on Github. You can read more information on the format the list uses below. Please note that the list is encoded using UTF-8. The copy on publicsuffix.org, linked below, is updated daily from Github. If you wish to make your app download an updated list periodically, please use this URL and have your app download the list no more than once per day. (The 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. The Public Suffix List is an initiative of Mozilla, but is maintained as a community resource. It is available for use in any software, but was originally created