how to resolve the database server hostname is too long ?

on creating a database with the DBCA i get the following error:

Instance created.

DIM-00019: create service error

O/S-Error: (OS 1053) The service did not respond to the start or control request in a timely fashion.

Doc ID 2652519.1 states the CAUSE

it was found that the error is because the server hostname > 15 characters

and

SOLUTION

Use server hostname less than 15 characters

so in my listener.ora and tnsnames.ora i change my host name to my IP address because the hostname was indeed longer than 15 characters. I restart the listener, but i still get the same error. I add my IP address to my hosts file I try creating a new listener but still get the same error.