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Q: Need reverse DNS program for list of IP addresses ( Answered 5 out of 5 stars,   0 Comments )
Subject: Need reverse DNS program for list of IP addresses
Category: Computers > Software
Asked by: holstein13-ga
List Price: $10.00
Posted: 09 Mar 2004 11:25 PST
Expires: 08 Apr 2004 12:25 PDT
Question ID: 314958
I have a list of IP addresses in a text document.  I would like to
export that list or paste it into a program that will perform reverse
DNS on it and give me a list of domain names related to the IP
addresses.  This program needs to run in MS windows.  I need to know
if such a program exists for under $200.00.

Basically, my firewall logs outgoing visits and I need to analyze the
Subject: Re: Need reverse DNS program for list of IP addresses
Answered By: haversian-ga on 09 Mar 2004 13:23 PST
Rated:5 out of 5 stars
Good afternoon,

Yes indeed, reverse DNS lookps are a fairly common thing to want to
do, and numerous programs exist for all manner of operating systems. 
There are even websites setup to do reverse DNS lookups for you.

If you have a plain text file with IP numbers in it, you can use an
application called QuickDNS ( ).  It comes
with a license that looks like it was ripped off some commercial app
or other, but is a free-to-use program.

Download the application and run the installer.  The program is a
command-line program, but can be run from the GUI if you prefer.  The
help file explains the options, but you will almost certainly be
interested in a command line like:

qdns -D c:\web\DNS.txt -L c:\web\list.of.IPs.txt -Y your.favorite.DNS server

That will use your favorite DNS server to lookup the IPs listed in
list.of.IPs.txt and will make entries in DNS.txt, one per line, with
the IP number and the associated domain name.  If run several times,
it uses the DNS.txt file to cache entries so it only needs to lookup
new IPs.  There are options for ageing entries in this file as you'd
like, if this is a useful or necessary feature for you.

I have tested this program and command line options on a plain text
file with one IP per line.  Not all IPs have reverse DNS entries (even
if they do have associated DNS names), but with that proviso, the app
ran as advertised.


holstein13-ga rated this answer:5 out of 5 stars and gave an additional tip of: $5.00
Excellent Answer.  Bravo.  I downloaded the program and ran it without
a hitch.  Works perfectly.

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