IP-Multicast difference between and block

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