The OSPF All Designated Routers (DR) address is used to send OSPF routing information to designated routers on a network segment. The Open Shortest Path First (OSPF) All OSPF Routers address is used to send Hello packets to all OSPF routers on a network segment. This address is used in the Distance Vector Multicast Routing Protocol (DVMRP) to address multicast routers. The All Routers multicast group addresses all routers on the same network segment.

The All Hosts multicast group addresses all hosts on the same network segment. The following table is a list of notable well-known IPv4 addresses that are reserved for IP multicasting and that are registered with the Internet Assigned Numbers Authority (IANA). The RFC also discusses structuring the 239.0.0.0 / 8 range to be loosely similar to the scoped IPv6 multicast address range described in RFC 1884. Per 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. Administratively scoped The 239.0.0.0 / 8 range is assigned by RFC 2365 for private use within an organization. A resulting advantage over GLOP is that the unicast-prefix mechanism resembles the unicast-prefix capabilities of IPv6 as defined in RFC 3306. Unicast-prefix-based The 234.0.0.0 / 8 range is assigned by RFC 6034 as a range of global IPv4 multicast address space provided to each organization that has / 24 or larger globally routed unicast address space allocated one multicast address is reserved per / 24 of unicast space. Unfortunately, with only 256 multicast addresses available to each autonomous system, GLOP is not adequate for large-scale broadcasters. RFC 3180, superseding RFC 2770, envisioned the use of the range for many-to-many multicast applications.

The method is not applicable to the newer 32-bit ASNs. In a nutshell, the middle two octets of this block are formed from assigned ASNs, giving any operator assigned an ASN 256 globally unique multicast group addresses. The allocation method is termed GLOP addressing and provides implementers a block of 255 addresses that is determined by their 16-bit autonomous system number (ASN) allocation. GLOP The 233.0.0.0 / 8 range was originally assigned by RFC 2770 as an experimental, public statically-assigned multicast address space for publishers and Internet service providers that wished to source content on the Internet. Source-specific multicast The 232.0.0.0 / 8 (IPv4) and ff3x:: / 32 (IPv6) blocks are reserved for use by source-specific multicast. These addresses are globally routed and are used for applications that don't fit either of the previously described purposes. 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. 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.

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