Reverse DNS: Difference between revisions

==About Reverse DNS==

Normal (forward) DNS is a system that allows you to look up information about a domain/host name. For example you might want to look up the IP address for the name my.firebrick.co.uk. To do this a normal DNS lookup is done for an A record called my.firebrick.co.uk and you get the answer 217.169.0.1.

Reverse DNS is about finding a name for an IP address. The system is quite simple, the IP address is converted to a name and a lookup done in the usual way. The record type for a reverse DNS lookup is a PTR record not an A record.

 

 

To delegate your IP addresses to you we have to find a way to delegate within the block of 256 addresses we have received from RIPE. Few customers have a complete block of 256 addresses. Those that do can simply be set up so that their own name servers are used in the delegation from RIPE. For anyone with less than 256 addresses we have to find a way to give you some of the addresses within a block - which DNS does not allow.

 

=Have AAISP Manage the Reverse DNS=