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IP-Multicast difference between 224.0.0.1-255 and 239.0.0.0/8 block

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http://serverfault.com – Whats the difference between: Local subnetwork Addresses in the range 224.0.0.0 to 224.0.0.255 are individually assigned by IANA and designated for multicasting on the local subnetwork only. For example, the Routing Information Protocol (RIPv2) uses 224.0.0.9, Open Shortest Path First (OSPF) uses 224.0.0.5 & 224.0.0.6, and Zeroconf mDNS uses 224.0.0.251. Routers must not forward these messages outside the subnet in which they originate. and Administratively Scoped IPv4 Multicast addresses The 239.0.0.0/8 range is assigned by RFC 2365 for private use within an organizati (HowTos)