Zhovner did an excellent job reverse engineering and deobfuscating Skype's sdk.  Thanks to his / her work, it is trivial to pull public and private IPs utilized by skype users.  Overall, not a big deal.  But if one is relying on skype to provide location privacy, then issues will arise.  Works for me and endorsed!

https://github.com/zhovner/Skype-iplookup/