Shoutbox

There are plugins that add other tags, like (!XIP), and that will show your external IP:

• externalIP 1.01
  
• Network IP Plugin
  
• Another External IP Finder

EDIT (March 2005): Since Messenger Plus! 3.20.100 these plugins have become obsolete because Messenger Plus! can now list both your internal and external IP's.

quote:

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from the Messenger Plus! changelog
The (!IP) tag now does what is should have have done: it returns the one, real, internet IP of your computer. This is achieved by getting a special page on the msgplus.net network that returns the IP of the requester. The old behavior or (!IP) is now available through a new (!IPN) tag (IP Network) and can still be useful in corporate and lan-party environments.

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EDIT (August 2004): Added all the plugins I could find that can do this... sorry Choli