http://www.rfc-editor.org/rfc/rfc1912.txt
RFC 1912: Common DNS Operational and Configuration Errors, D. Barr1996-02-01T23:00:00-00:00This memo describes errors often found in both the operation of Domain Name System (DNS) servers, and in the data that these DNS servers contain. This memo provides information for the Internet community. This memo does not specify an Internet standard of any kind.