A New Internet-Draft is available from the on-line Internet-Drafts directories.
Abstract: «The rise of spam and other anti-social behavior on the Internet has led to the creation of shared blacklists and whitelists of IP addresses or domains. The DNS has become a de-facto standard method of distributing these blacklists and whitelists. This memo documents the structure and usage of DNS based blacklists and whitelists, and the protocol used to query them.»
http://www.ietf.org/internet-drafts/draft-irtf-asrg-dnsbl-01.txt