I was wondering if I could use ip or host to get nickname on a network.
Some command perhaps? /whois and /dns gives you info from nick, but is there some commands that gives info from ip/host?

thanks

/who *host might work, but there's a 90% chance it won't since it doesn't return users who are +i (invisible). You can look at /lusers to see how many users are +i on the network.

Yep, for example Qnet has: "There are 31 users and 104557 invisible" so...
No other way then?

Thanks for the reply though

No general way, nope.
IRCOPs have (on some IRCDs at least) access to /who-flags that allow a host/IP search. And some networks feature a "seen"-service that allows wildcard- or host- based searches. Best would be to join the network's help channel and ask