If you are able to login to hiveCLI, you just have to execute below property.
hive> set hive.server2.thrift.port;
It should give you the port number where hiveserver2 is running. It looks something like below.
hive.server2.thrift.port=10014
Posting this after quite some time. I did not get lsof command. So used this workaround.
If you have hive access:
hive> set hive.metastore.uris;hive.metastore.uris=thrift://sandbox.hortonworks.com:9083
If you know the host and can logon: try
/usr/sbin/lsof -i