Re: Question about DNS naming conventions

[William Herrin <bill () herrin us>]

On Tue, Feb 11, 2025 at 9:13 AM Joel Sommers <jsommers () 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. This is useful for filtering
systems such as email spam filters where email servers know they
should only receive unauthenticated email from other email servers
which have been statically assigned an IP address and thus given a
real name.

Regards,
Bill errin


-- 
William Herrin
bill () herrin us
https://bill.herrin.us/