NANOG Digest, Vol 14, Issue 44

Mike Bailey mike at
Sat Mar 21 12:16:33 UTC 2009

nanog-request at wrote:
> hi,
>  I want to ask some folks out there that maintain reverse DNS queries
> of their respective IP blocks. I want to know if there is a need for
> me to contact my upstream provider. I am in charge of 2 /24's under
> LACNIC. I've already registered my DNS servers on LACNIC. but for some
> weird reason it's not owning reverse resolves. any tips would be
> gladly appreciated.
> thanks,
> b

You can use the dig utility that usually comes with bind to trace the NS 
records for the ip block down, just run:

# dig NS +trace

That will tell you what nameserver is directing you where. You can also 
use this web-based utility to query the root nameservers to figure out 
where your queries are being directed to: 
. Just make sure you are entering your ip in the reverse-dns, 
* format, and not the actual ip address.

> > Slighty related...
> >
> > Can people please post their recommended reverse dns naming 
> conventions for a small ISP with growth and scalability in mind.
> > I already have one drawn up, but I would like to contrast and compare :D
> >
> > Thanks

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