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dnsdbck verifies consistency of DNS information in an SQL database. It is part of dnstools, a set of utilities for DNS management and related tasks.

AnyEvent::CacheDNS provides a very simple DNS resolver that caches its results and can improve the connection times to remote hosts.

Net::DNS::Match is a Perl extension for testing domains against another list of domains (similar to Net::Patricia but for FQDNs).

This is Net::Bonjour, a set of perl modules to utilize DNS for service discovery. This method of service discovery is branded as Bonjour by Apple Computer.

Net::DNSBL::MultiDaemon is the Perl module that implements the multi_dnsbl daemon. multi_dnsbl is a DNS emulator daemon that increases the efficacy of DNSBL look-ups in a mail system. multi_dnsbl may be used as a stand-alone DNSBL or as a plug-in for a standard BIND 9 installation. multi_dnsbl shares a common configuration file format with the Mail::SpamCannibal sc_BLcheck.pl script so that DNSBL's can be maintained in a common configuration file for an entire mail installation. Because DNSBL usefulness is dependent on the nature and source of spam sent to a specific site and because sometimes DNSBL's may provide intermittant service, multi_dnsbl interrogates them sorted in the order of greatest successful hits. DNSBL's that do not respond within the configured timeout period are not interrogated at all after 6 consecutive failures, and thereafter will be retried not more often than once every hour until they come back online. This eliminates the need to place DNSBL's in a particular order in your MTA's config file or periodically monitor the DNSBL statistics and/or update the MTA config file.

POE::Filter::DNS::TCP is a POE::Filter for parsing and generating DNS messages received from or transmitted (respectively) over TCP as per RFC 1035.

tinystats is a statistic generator for DJB's tinydns. It can be easily integrated with rrdtool to generate nice graphical DNS stats.

Sleuth is a tool designed to check DNS zones for common errors and also for processing of secondary name service requests.

vhostcname synchronizes DNS with server names and aliases from Apache virtual host configuration. It is part of dnstools, a set of utilities for DNS management and related tasks.

whoseip returns information about IP addresses: country code and network they belong to. It is part of dnstools, a set of utilities for DNS management and related tasks.