Delegation of IP ranges for reverse DNS??

[Mark.Andrews at nominum.com]

	whois -h whois.arin.net 190.180.170.0

	Follow the trail from there.

> If a company is assigned a class C (e.g. 190.180.170.160/24), they can have
> this range delegated to they own local DNS servers, so that they can
> maintain their own reverse DNS.
> 
> I assume it is probable that this class C was assigned from a class B owned
> by their ISP or local Internet registry (190.180.170).
> 
> Assuming that the companies IP range is delegated to their server from a
> range maintained by the ISP server, Who delegates the class B to the ISP? -
> RIPE / ARIN / APNIC ?
> 
> I'm familiar with nslookup and tried the following:
> I found the authoritative name servers for the domain ripe.net (ns.ripe.net)
> and set this as the server in nslookup.
> I set the query type to NS
> I entered 170.180.190.in-addr.arpa and hoped for the best
> I received a list of the worlds root servers.
> 
> How can I check this delegation?
> Even better, how do I check this delegation, work out the range it was
> assigned from, check who made that delegation, etc ?
> 
> Thanks,
> 
> Ed
> 
> 
> 
> 
> 
> 
--
Mark Andrews, Nominum Inc.
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark.Andrews at nominum.com