DNS-AS Metadata Resource Record are expressed within a TXT DATA format
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
/ TXT-DATA /
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
TXT-DATA One or more <character-string>s.
- TXT RRs are used to hold descriptive text.
The semantics of the text depends on the domain where it is found.
- Originally for arbitrary human-readable text in a DNS record.
- Since the early 1990s, however, this record more often carries machine-readable data, such as specified by RFC 1464, opportunistic encryption, Sender Policy Framework, DKIM, DMARC, DNS-SD, etc.
- The base DNS specification limits DNS messages over UDP to 512 octets
- You can use multiple RRs, but this will make it complicated to sort the records