Dnswalk is a DNS debugger. It performs zone transfers of specified
domains, and checks the database in numerous ways for internal
consistency, as well as accuracy.
dnswalk is not for the faint of heart. It should NOT be
used without a firm knowledge of the DNS RFC’s. If you use this
tool for cracking or otherwise evil purposes, the author [...]

It is a tool that allows you to make a consultation by means of IP ranks to obtain DNS names of this IPs in addition with simplicity and speed.
(Source: http://backtrack.offensive-security.com/index.php?title=Tools#DNS-Ptr)
We used this command: dns-ptr 69.41.185.195 20

That all!
pavs

Backtrack 2 Hacking Hacking Tools News Software Review

DMitry (Deepmagic Information Gathering Tool) is a UNIX/(GNU)Linux Command Line Application coded in C. DMitry has the ability to gather as much information as possible about a host. Base functionality is able to gather possible subdomains, email addresses, uptime information, tcp port scan, whois lookups, and more.
The following is a list of the current features:
An [...]

Backtrack 2 is the last edition of a very famous and widely used penetration testing Linux Live Distro. We will try to do walkthrough of every single (or as much as possible) tools that comes with backtrack 2. Since this is a very large project, and the distro itself contains approximately 255 unique tools. It [...]