[gentoo-user] [OT DNS] common way to discover nameservers for an IP

[gentoo-user] [OT DNS] common way to discover nameservers for an IP

[reader]

I know I've once known and used a command that listed the nameservers
serving a given IP.

I don't remember if it was nslookup, host, dig or what but not finding
it in those various man pages.

I know there are online sites that will do it, but does anyone know a
command line tool that gives that information once given the right syntax?

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Re: [gentoo-user] [OT DNS] common way to discover nameservers for an IP

[Boyd Stephen Smith Jr.]

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On Sunday 01 April 2007, reader@newsguy.com wrote about '[gentoo-user]  [OT 
DNS] common way to discover nameservers for an IP':
> I know I've once known and used a command that listed the nameservers
> serving a given IP.
>
> I don't remember if it was nslookup, host, dig or what but not finding
> it in those various man pages.

You probably want:
dig NS -x $IP

-- 
Boyd Stephen Smith Jr.                     ,= ,-_-. =. 
bss03@volumehost.net                      ((_/)o o(\_))
ICQ: 514984 YM/AIM: DaTwinkDaddy           `-'(. .)`-' 
http://iguanasuicide.org/                      \_/     

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[gentoo-user] Re: [OT DNS] common way to discover nameservers for an IP

[Remy Blank]

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reader@newsguy.com wrote:
> I know I've once known and used a command that listed the nameservers
> serving a given IP.

dig -x 123.45.67.89

HTH.
-- Remy


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[gentoo-user] Re: [OT DNS] common way to discover nameservers for an IP

[Alexander Skwar]

reader@newsguy.com <reader@newsguy.com> wrote:

> I know I've once known and used a command that listed the nameservers
> serving a given IP.

What do you with that? There's no such thing - any nameserver _can_
return any IP.

> I know there are online sites that will do it, 

Like?

Alexander Skwar

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Re: [gentoo-user] Re: [OT DNS] common way to discover nameservers for an IP

[Alan McKinnon]

On Monday 02 April 2007, Alexander Skwar wrote:
> reader@newsguy.com <reader@newsguy.com> wrote:
> > I know I've once known and used a command that listed the
> > nameservers serving a given IP.
>
> What do you with that? There's no such thing - any nameserver _can_
> return any IP.

He's actually after the NS record from the authoritative server for the 
zone, but doesn't have the FQDN yet, only an IP. The answer he'll get 
from dig is necessarily fuzzy, but hey, them's the breaks


alan

-- 
Optimists say the glass is half full,
Pessimists say the glass is half empty,
Developers say wtf is the glass twice as big as it needs to be?

Alan McKinnon
alan at linuxholdings dot co dot za
+27 82, double three seven, one nine three five
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[gentoo-user] Re: [OT DNS] common way to discover nameservers for an IP

[James]

Alan McKinnon <alan <at> linuxholdings.co.za> writes:

> 
> On Monday 02 April 2007, Alexander Skwar wrote:
> > reader <at> newsguy.com <reader <at> newsguy.com> wrote:
> > > I know I've once known and used a command that listed the
> > > nameservers serving a given IP.
> >
> > What do you with that? There's no such thing - any nameserver _can_
> > return any IP.
> 
> He's actually after the NS record from the authoritative server for the 
> zone, but doesn't have the FQDN yet, only an IP. The answer he'll get 
> from dig is necessarily fuzzy, but hey, them's the breaks


Maybe he curious about query's starting at the root servers? For example:



dig @A.ROOT-SERVERS.net gentoo.org




hth,
James

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Re: [gentoo-user] Re: [OT DNS] common way to discover nameservers for an IP

[Uwe Thiem]

On 02 April 2007, Alexander Skwar wrote:
> reader@newsguy.com <reader@newsguy.com> wrote:
> > I know I've once known and used a command that listed the nameservers
> > serving a given IP.
>
> What do you with that? There's no such thing - any nameserver _can_
> return any IP.

Authoritative answers can only be obtained from name servers responsible for 
that particular domain.

nslookup
server xxx.yyy.zzz.ttt           (insert any name server kown to you)
set type=ns
domain.in.question

Uwe

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RE: [gentoo-user] [OT DNS] common way to discover nameservers for an IP

[Adam Carter]

> I know I've once known and used a command that listed the nameservers
> serving a given IP.
> 
> I don't remember if it was nslookup, host, dig or what but not finding
> it in those various man pages.

I have made a different assumtion about what your question means than
other posters - assuming you want to find which nameserver is hosting
the reverse lookup zone, with gentoo.org's IP address as an example;

adam@rix ~ $ host gentoo.org
gentoo.org has address 204.74.99.100
gentoo.org mail is handled by 10 mail.gentoo.org.
gentoo.org mail is handled by 40 mx2.gentoo.org.

So to find out who's hosting the reverse record for 204.74.99.100 we
reverse the first three octets and add in.addr.arpa, ie;

adam@rix ~ $ host -t NS 99.74.202.in-addr.arpa.
99.74.202.in-addr.arpa name server hk-dns1.hk.prserv.net.
99.74.202.in-addr.arpa name server hk-dns2.hk.prserv.net.

Rgs,
Adam
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[gentoo-user] Re: [OT DNS] common way to discover nameservers for an IP

[reader]

Alexander Skwar <listen@alexander.skwar.name> writes:

> reader@newsguy.com <reader@newsguy.com> wrote:
>
>> I know I've once known and used a command that listed the nameservers
>> serving a given IP.
>
> What do you with that? There's no such thing - any nameserver _can_
> return any IP.
>
>> I know there are online sites that will do it, 
>
> Like?
I guess your response represents economy of effort at its best eh?

Try this:
http://www.dnsstuff.com/tools/traversal.ch?domain=www.gentoo.org..&type=A

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[gentoo-user] Re: [OT DNS] common way to discover nameservers for an IP

[reader]

Uwe Thiem <uwix@iway.na> writes:

> On 02 April 2007, Alexander Skwar wrote:
>> reader@newsguy.com <reader@newsguy.com> wrote:
>> > I know I've once known and used a command that listed the nameservers
>> > serving a given IP.
>>
>> What do you with that? There's no such thing - any nameserver _can_
>> return any IP.
>
> Authoritative answers can only be obtained from name servers responsible for 
> that particular domain.
>
> nslookup
> server xxx.yyy.zzz.ttt           (insert any name server kown to you)
> set type=ns
> domain.in.question

Thanks... and  I think that is the one I was remembering.  But now I
see the dig syntax:

  dig NS -x $IP (thanks for that Boyd) it is quicker and more informative.   

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