Author image Richard Simões
and 1 contributors


Mozilla::PublicSuffix - Get a domain name's public suffix via the Mozilla Public Suffix List


    use feature qw(say);
    use Mozilla::PublicSuffix qw(public_suffix);

    say public_suffix('org');       # 'org'
    say public_suffix('');  # 'org'
    say public_suffix('perl.orc');  # undef
    say public_suffix(''); # ''
    say public_suffix(''); # undef


This module provides a single function that returns the public suffix of a domain name by referencing a parsed copy of Mozilla's Public Suffix List. From the official website at

    A "public suffix" is one under which Internet users can directly register names. Some examples of public suffixes are com, and The Public Suffix List is a list of all known public suffixes.

A copy of the official list is bundled with the distribution. As the official list continues to be updated, the bundled copy will inevitably fall out of date. Aside from new releases always including the latest version of the list, this distribution's installer provides the option (defaults to "No") to check for a new version of the list and download/use it if one is found.



Exported on request. Simply returns the public suffix of the passed domain name, or undef if either the domain name is not well-formed or the public suffix is not found.



Similar to this module, with an object-oriented interface and somewhat alternative interpretation of the rules Mozilla stipulates for determining a public suffix.


Richard Simões <rsimoes AT cpan DOT org>


Copyright © 2013 Richard Simões. This module is released under the terms of the MIT License and may be modified and/or redistributed under the same or any compatible license.