$address (nick)
From Scriptwiki
Searches the Internal Address List for the address associated with the specified nickname.
$address(nickname,type)
Note that if the Internal Address List doesn't contain a matching nickname, the identifier returns $null.
To get a list of all types, look at $mask.
Example
echo -a $address(Dana,5)
This example will return Dana!dana@staff.quakenet.org.
mode $chan -o+b $nick $iif(*.users.quakenet.org iswm $address($nick,2),$v2,$address($nick,3))
This example will check if someones host is <QAuth>.users.quakenet.org and if it is, use banmask type 2 on them, else use mask type 3.
See Also
$ial returns the Nth address matching mask in the IAL.