Sunday, January 11, 2009

Reverse lookup dns zone

Reverse lookup dns zones are used to provide address-to-name resolution. In this, A DNS client uses a known IP address and looks for the host name of that address.

The following illustrates the general reverse dns look up query process:

1. Assume IP address for which name resolution needed is
2. A DNS client queries the DNS server for a pointer (PTR) resource record which maps the IP address to a host name "user".
3.The DNS server reverses the address and appends the domain name "" to the end of the reversed IP address. Now the resultant address to search becomes " Now this fully qualified domain name (FQDN). i.e be searched in a reverse lookup zone.

4. After the is located in authoritative DNS server, the authoritative DNS server for can respond with the pointer (PTR) resource record information which includes the DNS name "" for the IP address, which completes the reverse lookup process.
To create reverse lookup zone, follow the link Create Reverse Lookup zone


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