Though this is not a question specific to AIX, it appears often enough
to warrant an answer here.  There are lots of approaches, some of which
are described in the X Windows FAQ.  Most involve a little login shell
programing to parse the output of `who` or `who am i`.
<URL:ftp://boogle.uchicago.edu/pub/aix/src/hostwhence.tar.Z> by
e-siebert@uchicago.edu will help if you are willing/able to install it
suid.  See the X Windows FAQ and newsgroup for more information.

Hostwhence is also availabile in the "lsof" smit-installable package on
www-frec.bull.com. The installation scripts use ACLs to allow hostwhence to
read /dev/kmem without being set-uid-root.

Some parts © 2009 Advameg, Inc.