Do you mean logins with NickServ-type bots?
That depends on the services. On QuakeNet you can do
/msg Q whois Collective and it will notice you back a list like this:
[04:55:16] -Q- Collective is online right now.
[04:55:16] -Q- Collective is authed as Collective.
[04:55:16] -Q- There are more users authed with that id.
[04:55:16] -Q- Bob is also authed as Collective
There might be ways on other services too, but I rarely use them so I don't know.