how DNS client perform reverse lookup

Barry Margolin barmar at
Tue Jan 25 02:56:01 UTC 2005

In article <ct3ioj$1qll$1 at>, Keith Ng <ngkeith at> 

> Hi,
> Would someone tell me how DNS client perform reverse lookup? Is there 
> any root servers like forwards lookup for the in-addr.apra domain?

They start from the normal root servers.  These servers have delegation 
records for, just like they do for com, net, etc.  The 
client servers follow this reverse delegation in exactly the same way 
that they follow forward delegations.  As far as the nameservers are 
concerned, there's no difference between forward and reverse DNS; 
everything is just arbitrary labels to the servers and resolvers.

Barry Margolin, barmar at
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***

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