The mystery is solved.
When I had posted about this no one replied with any ideas what it was talking about.
While downloading a copy of the ST gateway to test for a project I found this:
IBM Lotus Sametime Gateway Server 188.8.131.52 Windows, IBM i Multilingual (CZ0KPML)
Date posted 20-Feb-2009
So another mystery solved, but now to start the process of downloading all the parts and pieces to get the Gateway up and running.