Question about Reverse mapping name servers

[Jeremy C. Reed]

On Wed, 3 Oct 2007, Reedy, Sean wrote:

> Can a DNS servers provide reverse-mapping (in-addr.arpa) for a block of
> IP addresses if those DNS server don't have an IP address in that block?

Sure. I have done that.

> I'm asking because ARIN requires two name servers whenever you receive a
> block of addresses from them.
> 
> How do you delegate reverse lookup to other name servers from the name
> servers you informed ARIN of?

NS record.

Search for RFC 2317. It has some different ideas too using CNAME.

See http://www.dyndns.com/support/kb/reverse_dns_in_custom_dns.html for 
several examples. (Not advocating that service, but google found that 
howto.)