https://app.knowbase.one/vault/rfc/docid/7188
RFC6604: xNAME RCODE and Status Bits Clarification
Internet Engineering Task Force (IETF) D. Eastlake 3rd Request for Comments: 6604 Huawei Updates: 1035, 2308, 2672 April 2012 Category: Standards Track ISSN: 2070-1721 xNAME RCODE and ...