It appears that William Herrin <b...@herrin.us> said: >On Tue, Feb 11, 2025 at 9:13 AM Joel Sommers <jsomm...@colgate.edu> wrote: >> What are some of the key use cases for having an A record (or AAAA for that >> matter) in which part or all of the address is embedded >in the name? > >server = real DNS name >random end user = DNS name which embeds the IP address > >The A record is meant to match the PTR record. The PTR record embeds >the address typically as a signal that the address is not statically >assigned to a particular use or user. ...
Right. The names are usually created with BIND's $GENERATE extension or the equivalent in other DNS software. There is a great deal of variation in the details of the names beyond the fact that they embed all or part of the IP address. I know a guy who has collected a lot of regular expressions to match them. See http://enemieslist.com R's, John
