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Detection of registered domains by reg-dom libs
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The reg-dom libs are available in C, Perl and PHP so far.

They include recent representations of the effective TLD list available at
https://publicsuffix.org/list/effective_tld_names.dat
and help to convert an arbitrary domain name to the registered domain name.

Sample use:
dkim-reputation.org blocks signing domains on the level of registered domains
to rate senders who use e.g. a.spamdomain.tld, b.spamdomain.tld, ... under
the most common identifier - the registered domain - finally.
Project page: https://www.agitos.de/registered-domain-libs/
Updated library downloads: https://services.agitos.de/regdom-lib-downloads/

Pseudo code:
registeredDomain = getRegisteredDomain(ingoingDomain);

Return values:
1) NULL if ingoingDomain is a TLD
2) the registered domain name if TLD is known
3) just <domain>.<tld> if <tld> is unknown
   This case was added to support new TLDs in outdated reg-dom libs
   by a certain likelihood. This fallback method is implemented in the
   last conversion step and can be simply commented out.

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If you like to regenerate the effective TLD tree structure by yourself
you can use the script generateEffectiveTLDs.php with the following parameters:

php generateEffectiveTLDs.php php  > PHP/effectiveTLDs.inc.php
php generateEffectiveTLDs.php perl > Perl/effectiveTLDs.pm
php generateEffectiveTLDs.php c    > C/tld-canon.h


   
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Florian Sager, 2009-02-05, sager@agitos.de, http://www.agitos.de