Obviously there's some mechanism exposed to channel operators (or implemented automatically by the network) which prompts a ban of the unmasked address, however this can vary from network to network and is not related to mIRC. Ask about it on that network.
It is in the chathispano network, and I asked help and do not know.
The format of the ban is obviously a AKICK.
I thought that reading the information we send the bot CHaN of akick there was some way to take that ban to the real ip, in real time.