Whats the difference between:
Addresses in the range 18.104.22.168 to 22.214.171.124 are individually assigned by IANA and designated for multicasting on the local subnetwork only. For example, the Routing Information Protocol (RIPv2) uses 126.96.36.199, Open Shortest Path First (OSPF) uses 188.8.131.52 & 184.108.40.206, and Zeroconf mDNS uses 220.127.116.11. Routers must not forward these messages outside the subnet in which they originate.
Administratively Scoped IPv4 Multicast addresses
The 18.104.22.168/8 range is assigned by RFC 2365 for private use within an organization. From the RFC, packets destined to administratively scoped IPv4 multicast addresses do not cross administratively defined organizational boundaries, and administratively scoped IPv4 multicast addresses are locally assigned and do not have to be globally unique. The RFC also discusses structuring the 22.214.171.124/8 range to be loosely similar to the scoped IPv6 multicast address range described in RFC 1884.
Am i right that if you use the 224 block you have to adapt to the guides that are described in the RFC to the IANA reserved addresses while on the 239 block you can do what you want?