How do I configure reverse DNS lookup?
The Domain Name System, better known as DNS, is the distributed directory service primarily used for mapping human-friendly hostnames like “www.mysite.net” into IP addresses like “11.22.33.44.” Reverse DNS queries use special PTR records–called pointer records–to point from IP addresses back to hostnames.Understanding Reverse DNS LookupsUnlike hostnames, IP addresses are written in left-to-right order. The Domain Name System is designed to handle only hostnames. To accommodate IP addresses, DNS requires IP addresses to be stored in reverse order: the address “12.34.56.78” is processed as “78.56.34.12.in-addr.arpa.”Configuring Reverse DNS RecordsIf your Internet service provider has delegated to you authority over your reverse DNS records, you must establish exactly one “PTR” record for each IP address.
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