Basically a Skype resolver on steroids. Got the idea from Starfall. Sample output:

root@localhost:~$ python recursive_skype_resolve.py
Usage: python recursive_skype_resolve.py [USERNAME]

root@localhost:~$ python recursive_skype_resolve.py echo123
Starting Recursive Skype Resolver...
Discovering associated accounts and IP addresses...
Recursive Skype resolve has been completed, 7 account(s) and 6 IP address(es) were identified.
Account(s): echo123 (Current IP: NULL) - hf.matt (Current IP: NULL) - blacklisttest (Current IP: NULL) - thrdude (Current IP: NULL) - roots.ec (Current IP: NULL) - bacongucci (Current IP: NULL) - lylan (Current IP: NULL)
IP Address(es): 1.2.3.4 - 13.37.69.69 - 1.240.108.234 - 86.180.34.246 - 99.226.138.82 - 68.200.246.166

As the above results indicate, it seems as if echo123 has been accessed by a few Hackforums members. Hehe How does this work, you may ask? Simple, it begins with the target account, attempts to resolve it and find previous IP addresses. From there, it tries to find other accounts associated with the discovered IP addresses, acquires their current and previous IP addresses, and keeps going until it has found all accounts and IP addresses that are in some way linked to the subject account. It recursively enumerates accounts and IP addresses. This tool is extremely useful for doxing and goes to show that you should __never__ use the same IP address accross identities, even if it's a VPN. Any thoughts, questions, or suggestions? I might make this public in the form of a web service or restricted bash shell in the future, not entirely sure though.