Be sure to check out the main Bogon Reference for more information on the project and terminology used, and why it is important to keep your bogon filters up-to-date.
We provide bogon tracking through DNS via several reversed-IP zones. These zones are queried by reversing the octets of an IPv4 address (or nibbles of an IPv6 address) and appending a zone name, much like reverse DNS (in-addr.arpa and ip6.arpa) and DNSBL queries.
If the IP address represented by a given query is a bogon, the response will be an A RR of 127.0.0.2. You may also query for a TXT RR, which will indicate the bogon prefix within which the given address resides (no TXT record will be present for non-bogon queries).