https://app.knowbase.one/vault/rfc/docid/962
RFC0973: Domain system changes and observations
Network Working Group Paul Mockapetris Request for Comments: 973 ISI January 1986 Domain System Changes and Observations STATUS OF THIS MEMO ...
https://app.knowbase.one/vault/rfc/docid/7038
RFC6471: Overview of Best Email DNS-Based List (DNSBL) Operational Practices
Internet Research Task Force (IRTF) C. Lewis Request for Comments: 6471 Nortel Networks Category: Informational M. Sergeant ISSN: 2070-1721 Symantec Corporation ...