🚨Please note dnsmap has moved to github.com/pagvac/dnsmap

dnsmap - scan for subdomains using brute-forcing techniques

Help this project

dnsmap needs your help. If you are a programmer and if you want to help a nice project, this is your opportunity.

dnsmap was imported from some tarballs (the original homepage1 and developers are inactive). After this, all patches found in Debian project and other places for this program were applied. All initial work was registered in ChangeLog file (version 1.6 and later releases). dnsmap is being packaged in Debian2 Project.

If you are interested to help dnsmap, read the CONTRIBUTING.md file.

What is dnsmap?

dnsmap scans a domain for common subdomains using a built-in or an external wordlist (if specified using -w option). The internal wordlist has around 1000 words in English and Spanish as ns1, firewall servicios and smtp. So will be possible search for smtp.example.com inside example.com automatically. Results can be saved in CSV and human-readable format for further processing. dnsmap does NOT require root privileges to be run, and should NOT be run with such privileges for security reasons.

dnsmap was originally released back in 2006 and was inspired by the fictional story "The Thief No One Saw" by Paul Craig, which can be found in the book "Stealing the Network - How to 0wn the Box".

dnsmap is mainly meant to be used by pentesters during the information gathering/enumeration phase of infrastructure security assessments. During the enumeration stage, the security consultant would typically discover the target company's IP netblocks, domain names, phone numbers, etc.

Subdomain brute-forcing is another technique that should be used in the enumeration stage, as it's especially useful when other domain enumeration techniques such as zone transfers don't work (I rarely see zone transfers being publicly allowed these days by the way).

Fun things that can happen:

1. Finding interesting remote access servers (e.g.: https:://extranet.example.com).

2. Finding badly configured and/or unpatched servers (e.g.: test.example.com).

3. Finding new domain names which will allow you to map non-obvious/hard-to-find netblocks of your target organization (registry lookups - aka whois is your friend).

4. Sometimes you find that some bruteforced subdomains resolve to internal IP addresses (RFC 1918). This is great as sometimes they are real up-to-date "A" records which means that it is possible to enumerate internal servers of a target organization from the Internet by only using standard DNS resolving (as opposed to zone transfers for instance).

5. Discover embedded devices configured using Dynamic DNS services (e.g.: IP Cameras). This method is an alternative to finding devices via Google hacking techniques.

Build and Install

To build and install, run the following commands:

$ ./autogen.sh
$ ./configure
$ make
# make install

To return to original source code you can use '$ make distclean' command.

On Debian systems you can use '# apt install dnsmap'.

Author

dnsmap was originally developed by "pagvac" under GPL-2+ license.

Currently, the source code and newer versions are available at https://github.com/pagvac/dnsmap