https://app.knowbase.one/vault/rfc/docid/6307
RFC5782: DNS Blacklists and Whitelists
Internet Research Task Force (IRTF) J. Levine Request for Comments: 5782 Taughannock Networks Category: Informational February 2010 ISSN: 2070-1721 DNS Blacklists and Whitelists Abstr...