As enrico said, contact your support group. CICS regions do not have IP addresses; LPARs are associated with an IP address and a CICS region is usually allocated certain ports of the IP address. Which ports? Only your site support group knows for sure.
If you have access to see the cics control tables, you can see the IP and port in SIT ( system initialization table ) there as well. You will be able to see the cics control table data sets in the cics job log (in spool).