Steven J. Sobol sjsobol at
Tue Mar 16 15:20:51 UTC 1999

> I was trying to find a way to check whether an IP address is used by some
> host without actually probing it. DNS sounds like a good way to go, but
> I'v heard that domain "IN-ARPA.ADDR" is not well maintained and updated.
> Is that true? If so, how un-dependable it could be?

Very. Some ISP's don't maintain rDNS at all.

Steve Sobol sjsobol at (AKA support at and abuse at

    "The world is headed for mutiny/When all we want is unity"
          --Creed, "One"

More information about the NANOG mailing list