Thats what I'm saying.

Its only good to use it to check if an address iswm $address($nick,5).

I mean if you use it like this

if (*!*@host iswm $address($nick,5)) { do commands... 

And also a script like this can be spammed quite easily.
You need to remember that if someone banned more than just one part of your $fulladdress then you will only unban just 1 of them.
You should instead make it:

mode # $+(-,$str(b,11),+b) $regsubex($str(~,11),/(.)/g,$+($mode(\n),$chr(32))) $address($nick,2)

This will unban the first 11 modes (if 11 bans were set on you) that were activated in the On Ban section and then ban the address.