Change IP of the RTP Service

Dear Supportteam,
by changing the default IP of the RTP Service (239.1.1.x) we're detecting a failure. So a changing of the IP is displayed in the status but only IPs worked, those first octet is exactly 239 (like 239.8.8.8).
Is there a way to change the first octet of the RTP-IP to align the IP to the IP-Range where the devices should work?
thanks in advance!
by changing the default IP of the RTP Service (239.1.1.x) we're detecting a failure. So a changing of the IP is displayed in the status but only IPs worked, those first octet is exactly 239 (like 239.8.8.8).
Is there a way to change the first octet of the RTP-IP to align the IP to the IP-Range where the devices should work?
thanks in advance!