Localinfo
From Scriptwiki
Looks up and sets your local info settings.
/localinfo -uh [host ip]
The -u switch performs a /userhost lookup, the -h switch does a normal lookup.
If you wish, you can also set the local info manually by specifying the host and ip values.
Example
/localinfo -u
Performs a /userhost lookup
/localinfo -h
Performs a normal lookup.
/localinfo my.host.com 12.34.56.78
Manually sets your host to my.host.com and IP to 12.34.56.78.