Information Security

Backtrack 4: Information Gathering: DNS: Dnsenum – Enumerate information on a domain and discover non-contiguous ip blocks

Dnsenum is a very robust script which was actually written by one of the Backtrack developers when Backtrack was still a Remote-Exploit Project. The author, Filip (barbsie) Waeytens is a Web Application penetration tester and has extensive experience on the topic of DNS and information gathering. Today we will look at some examples of using Dnsenum to passively gather information on a target.

Technology Errors

Warning: Can’t Load Net::Whois::IP Module, Whois Queries Desabled

In going through all the tools with Alex on Backtrack I have discovered a few bugs and missing modules or libs. I will be writting posts on how to fix them but I will also be adding the fix’s to Backtrack svn as well. This morning I was writting the article on Dnsenum by my buddy Barbsie and I ran into a missing perl module.


  1. root@666:/pentest/enumeration/dnsenum# ./ --enum -f dns.txt --update a -r
  2. VERSION:1.2
  3. Warning: can't load Net::Whois::IP module, whois queries desabled.

Below I will show to to download and install the needed module:

Technology Errors

vBulletin: You Specified a Tag That Was Too Long. A Tag Can Only be 25 Characters

As many people know I am one of the administrators of the Backtrack-Linux forums. We generally do not have to many issues but today I had someone complaining that when posting code they were not able to use more than 25 characters. This is a issue since we encourage our users to use the tags for there posts since it makes adding code much neater and easier to read & copy/paste. Below I will describe how to fix the error.