Reverse DNS: Difference between revisions

Delegation by CNAME is a way to delegate a block of addresses to you so that you only have one zone file to worry about. The way this works is that we put a CNAME record for each address indicating that the answer is found under a different name. We then delegate that different name to your name servers. There are several ways to do this, but we use the system of first-last.restofzone.in-addr.arpa. e.g. if you had 217.169.0.0-3 we would delegate a zone 0-3.0.169.217.in-addr.arpa to your name server(s) and add CNAME entries for each IP, e.g. 1.0.169.217.in-addr.arpa with CNAME to 1.0-3.0.169.217.in-adrraddr.arpa .