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Multicast Addresses

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Common Permanent Multicast Addresses


BASE-ADDRESS.MCAST.NET

224.0.0.0 The reserved base address. This is never assigned to any multicast group.


ALL-SYSTEMS.MCAST.NET

224.0.0.1 All systems on the local subnet.


ALL-ROUTERS.MCAST.NET

224.0.0.2 All routers on the local subnet.


DVMRP.MCAST.NET

224.0.0.4 All Distance Vector Multicast Routing Protocol (DVMRP) routers on this subnet. An early version of the DVMRP protocol is documented in RFC 1075; the current version has changed substantially.


MOBILE-AGENTS.MCAST.NET

224.0.0.11 Mobile agents on the local subnet.


DHCP-AGENTS.MCAST.NET

224.0.0.12 This multicast group allows a client to locate a Dynamic Host Configuration Protocol (DHCP) server or relay agent on the local subnet.


PIM-ROUTERS.MCAST.NET

224.0.0.13 All Protocol Independent Multicasting (PIM) routers on this subnet.


RSVPENCAPSULATION.MCAST.NET

224.0.0.14 RSVP encapsulation on this subnet. RSVP stands for Resource reSerVation setup Protocol, an effort to allow people to reserve a guaranteed amount of Internet bandwidth in advance for an event.


NTP.MCAST.NET

224.0.1.1 The Network Time Protocol.


SGI-DOG.MCAST.NET

224.0.1.2 Silicon Graphics Dogfight game.


NSS.MCAST.NET

224.0.1.6 The Name Service Server.


AUDIONEWS.MCAST.NET

224.0.1.7 Audio news multicast.


SUB-NIS.MCAST.NET

224.0.1.8 Sun's NIS+ Information Service.


MTP.MCAST.NET

224.0.1.9 The Multicast Transport Protocol.


IETF-1-LOWAUDIO.MCAST.NET

224.0.1.10 Channel 1 of low-quality audio from IETF meetings.


IETF-1- AUDIO.MCAST.NET

224.0.1.11 Channel 1 of high-quality audio from IETF meetings.


IETF-1-VIDEO.MCAST.NET

224.0.1.12 Channel 1 of video from IETF meetings.


IETF-2-LOW-AUDIO.MCAST.NET

224.0.1.13 Channel 2 of low-quality audio from IETF meetings.


IETF-2-AUDIO.MCAST.NET

224.0.1.14 Channel 2 of high-quality audio from IETF meetings.


IETF-2-VIDEO.MCAST.NET

224.0.1.15 Channel 2 of video from IETF meetings.


MUSIC-SERVICE.MCAST.NET

224.0.1.16 Music service.


SEANETTELEMETRY.MCAST.NET

224.0.1.17 Telemetry data for the U.S. Navy's SeaNet Project to extend the Internet to vessels at sea. See http://web.nps.navy.mil/.


SEANET-IMAGE.MCAST.NET

224.0.1.18 SeaNet images.


MLOADD.MCAST.NET

224.0.1.19 MLOADD measures the traffic load through one or more network interfaces over a number of seconds. Multicasting is used to communicate between the different interfaces being measured.


EXPERIMENT.MCAST.NET

224.0.1.20 Experiments that do not go beyond the local subnet.


XINGTV.MCAST.NET

224.0.1.23 XING Technology's Streamworks TV multicast.


MICROSOFT.MCAST.NET

224.0.1.24 Used by Windows Internet Name Service (WINS) servers to locate one another.


MTRACE.MCAST.NET

224.0.1.32 A multicast version of traceroute.


224.2.0.0-224.2.255.255 The Multicast Backbone on the Internet (MBONE) addresses are reserved for multimedia conference calls, i.e., audio, video, whiteboard, and shared web browsing between many people.


224.2.2.2 Port 9,875 on this address is used to broadcast the currently available MBONE programming. You can look at this with the X Window utility sdr or the Windows/Unix multikit program.


239.0.0.0-239.255.255.255 Administrative scope, in contrast to TTL scope, uses different ranges of multicast addresses to constrain multicast traffic to a particular region or group of routers. For example, the IP addresses from 239.178.0 to 239.178.255 might be an administrative scope for the state of New York. Data addressed to one of those addresses would not be forwarded outside of New York. The idea is to allow the possible group membership to be established in advance without relying on lessthan- reliable TTL values. The exact divisions of this range into particular scopes remains to be defined.

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