How to stop impersonators

[Dynamite]

Using nicknameblacklist without IP is kinda agaist what it should do imo.

So, adding for you something like:

accept MykeGregory 192.0.0.1 46.0.0.0/8

Will only let you use the name if you are in the IP/IP range listed.

Of course a /8 range is to big but that was just an example.

I don't really understand the CIDR ranges very well. I was reading about them on Wikipedia. Sorry if this is a noob question. :)

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Also, how do I figure out what this guy's IP is? I have no idea, and I'm not an admin on the server.