![]() ![]() ![]() AD-HOC block Addresses in three separate blocks are not individually assigned by IANA. This block of addresses is used for traffic that must be routed through the public Internet, such as for applications of the Network Time Protocol using 224.0.1.1. Internetwork control block Addresses in the range 224.0.1.0 to 224.0.1.255 are individually assigned by IANA and designated as the internetwork control block. Routers must not forward these messages outside the subnet from which they originate. For example, the Routing Information Protocol (RIPv2) uses 224.0.0.9, Open Shortest Path First (OSPF) uses 224.0.0.5 and 224.0.0.6, and Multicast DNS uses 224.0.0.251. Local subnetwork Addresses in the range of 224.0.0.0 to 224.0.0.255 are individually assigned by IANA and designated for multicasting on the local subnetwork only. The address range is divided into blocks each assigned a specific purpose or behavior.Ģ34.0.0.0 to 234.255.255.255 Address assignments from within this range are specified in RFC 5771, an Internet Engineering Task Force (IETF) Best Current Practice document (BCP 51). The CIDR notation for this group is 224.0.0.0 / 4. This originates from the classful network design of the early Internet when this group of addresses was designated as Class D. IPv4 multicast addresses are defined by the most-significant bit pattern of 1110. Multicast addressing can be used in the link layer (layer 2 in the OSI model), such as Ethernet multicast, and at the internet layer (layer 3 for OSI) for Internet Protocol Version 4 (IPv4) or Version 6 (IPv6) multicast. ![]() For broader coverage of this topic, see Multicast.Ī multicast address is a logical identifier for a group of hosts in a computer network that are available to process datagrams or frames intended to be multicast for a designated network service. ![]()
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