How do I set up reverse DNS on MaraDNS?
By using PTR (pointer) records. For example, the PTR record which performs the reverse DNS lookup for the ip 1.2.3.4 looks like this in a CSV1 zone file: P4.3.2.1.in-addr.arpa.|86400|www.example.com. If you wish to have a PTR (reverse DNS lookup; getting a DNS name from a numeric IP) record work on the internet at large, it is not a simple matter of just adding a record like this to a MaraDNS zonefile. One also needs control of the appropriate in-addr.arpa. domain. While it can make logical sense to contact the IP 10.11.12.13 when trying to get the reverse DNS lookup (fully qualified domain name) for a given IP, DNS servers don’t do this. DNS server, instead, contact the root DNS servers for a given in-addr.arpa name to get the reverse DNS lookup, just like they do with any other record type. When an internet service provider is given a block of IPs, they are also given control of the DNS zones which allow them to control reverse DNS lookups for those IPs. While it is possible to obtai
