Before configuring the IP-output, you must familiarize yourself with the rules and guidelines for IPv4 Multicast addresses and ports.

The multicast range 239.x.x.x are typically used for IP-TV in private networks.

Please read more here:

IETF IANA Guidelines for IPv4 Multicast Address Assignments : RFC5771

IANA Notes on IPv4 Multicast Address Space Registry :

Wikipedia article on Multicast addresses : Multicast address

HP switches: IP multicast address groups excluded from IGMP filtering: