trcroute service_name
In this command, service_name is the name of server mapped to an address in TNSNAMES.ORA or in Oracle Names.
Note: If you have configured your network to use listener load balancing, there may be more than one listener on different nodes for a database. If so, the Trace Route Utility might use any of the listeners, just as a regular connection request might. The output it returns shows you what listener node it used.