On Sun, Oct 11, 1998 at 08:01:19PM +0100, Neil Moore-Smith wrote:
> Who actually manages the reverse lookup domains? We got a bunch of subnets
> from our ISP, and I set up a primary name server, which works fine. If you
> do a whois query, mine is listed, along with the ISP's, and they do a zone
> transfer every day. So far so good. I also set up ccc.bbb.aaa.in-addr.arpa
> as a primary zone on my name server and maintain it. Are you saying that
> this should be registered?
It needs to be delegated, just like a whatever.com domain. If your networks
are /24 or greater, then whoever gave you the address space you use
(normally your upstream ISP) can arrange this.
> It seems to work, as mail programs that do a
> reverse lookup as an anti-spam check seem to go through OK. Who should it
> be registered with?
Possibly your upstream ISP's servers (which zone transfer from your primary)
are delegated to. This works fine. If this is the case, you have a "hidden"
or "stealth" primary, because no-one on the Internet knows about it (and
therefore it doesn't receive queries directly)
> Second, I always meant to ask someone... how do you do a reverse lookup, to
> find the host and domain name associated with an IP address?
nslookup a.b.c.d
which is equivalent to
nslookup -q=ptr d.c.b.a.in-addr.arpa.
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