Locate the DB2 connection port number on Linux

1)Open a DB2 command prompt
2)Verify you are on the correct instance

db2 get instance

3)Find the service name of your instance
db2 get dbm cfg | grep SVCE

You’ll get back something like :
TCP/IP Service Name     (SVCENAME) = db2mydb2

4)Use the service name to find the port number in the services file
e.g

db2 grep <my service> /etc/services

you’ll get back something like
<my service > 50000/tcp

Ref:Jack Vamvas