We can follow below steps to change IP address in Oracle Application/EBS environment

 Steps:

 1. Change the IP Address in the Server.

2. Verify the current ip address setup in the Oracle Applications environment. Connect as apps user into SQL*Plus and run:

select NODE_NAME, STATUS, NODE_MODE, NODE_ID,SERVER_ADDRESS, HOST, DOMAIN, WEBHOST, VIRTUAL_IP from fnd_nodes where node_name = upper('&hostname');

3. Run the following command to remove the old ip address from the Oracle Applications tables:

perl $AD_TOP/bin/adgentns.pl appspass=apps contextfile=$APPL_TOP/admin/$CONTEXT_NAME.xml -removeserver 

 replace $CONTEXT_NAME for the context file name under the $APPL_TOP/admin directory;

then connect to SQL*Plus as apps user and run:

begin
FND_NET_SERVICES.remove_server('&SID', '&HOSTNAME');
end;
/
commit;
/

replace by the SID of the environment and by the hostname in the environment. Both must be entered in upper case.

4. Run autoconfig to populate the values using the new IP Address.

5. Confirm the ip address has been changed to the new value changed in the step 1:

select NODE_NAME, STATUS, NODE_MODE, NODE_ID,SERVER_ADDRESS, HOST, DOMAIN, WEBHOST, VIRTUAL_IP from fnd_nodes where node_name = upper('&hostname');