Question about name servers

What utility can I use to discover the name server(s) on a subnet (of an ISP
I'm on)?

I wouldn't have to bother, but I'm behind a dumb router that can't figure it
out, so I had to ask a friend (on a different subnet) what his was and use
that.

I'd like to do it properly, but need a little help.

The router is a D-Link DI-604 and I'm running Debian Etch.

Thanks
--
If you wrestle in the mud with a pig.
you both get dirty, and the pig likes it.

-- Dave Dawson
.