Reverse delegation (RFC 2317) is the way IP-to-FQDN lookups are usually done now. Before this was popular, you could get your ISP to defer to your DNS for reverse records directly, versus them using a set of individual PTR records.
Even though the RFC was written in 1998, it took a while for it to catch on. For years, my DNS servers were using both methods.
Both methods make use of the .in-addr.arpa "domain" syntax.
Even though the RFC was written in 1998, it took a while for it to catch on. For years, my DNS servers were using both methods.
Both methods make use of the .in-addr.arpa "domain" syntax.