Try something like this:

!addtalk !checkhost*:I am $me $+ . you are $nick $+ . host of $2 is $address($2,5) $+ . Today is $fulldate $+ .

Then type

!checkhost other_nick_here

• as long as other_nick_here is on any of the bot's channel, the script will pick up the full address of the other user.

You can try other identifiers :)

Regarding $snick, ask mr Help what that is ;)