The guys over at skype-open-source found this interesting “howto” on pastebin regarding how to obtain the IP address (both public and internal IPs) of every Skype user: it even works if the “victim” is not on the “attacker” contact list, and vice-versa.
Here is the relevant info:
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Downloading this patched version of Skype 5.5: http://skype-open-source.blogspot.com/2012/03/skype55-deobfuscated-released.html
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Turn on debug-log file creation via adding a few registry keys: https://github.com/skypeopensource/skypeopensource/wiki/skype-3.x-4.x-5.x-enable-logging
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Make "add a Skype contact" action, but not send add request, just click on user, to view his vcard(general info about user). This will be enough.
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Take look in the log of the desired skypename.
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The record will be like this for real user ip: -r195.100.213.25:31101
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And like this for user internal network card ip: -l172.10.5.17
The original post is here Skype user IP-address disclosure – Pastebin.com.