If a program uses a multicast address starting with 224.n.n.n, the announcement uses the standard sdp announcement address, and all sdp tools and all other IP/TV Content Managers within the TTL limit of the program receive it.
However, if a program uses an administratively scoped IP multicast address (the range starting at 239.0.0.0), the program announcement uses the highest address of the administratively scoped address range set in your preferences
http://www.cisco.com/en/US/docs/app_ntwk_services/waas/iptv/v32/administration/guide/chap7.html#wp1014145