If you're referring the "UserID" you filled in at
ALT+O > Connect > IdentD then that is the 'username' part of the [email]username@hostname.[/email]
If this is changing often, especially with random letters, then it is most probably a virus - many of them have this characteristic in them. You might like to read
this thread. You can also read
this page.
Finally, you can use the
Search feature to search for other threads which have covered this topic. You may also search for "virus" or "trojan" and see what comes up there. For best results, expand to 'All Forums' and the date range to 'All Posts'.
If you use
/whois your-nickname you can see your [email]username@hostname[/email] on the first line.
If you do infact mean the hostname like bunar suggested, then you may be able to unmask it so it doesn't show random letters, usually by unsetting some sort of usermode - ask in the #Help channel of the network.
G'luck!
Regards,
