Appendix I. Well-Known IP Multicast Addresses

Some client server applications use a multicast packet in order to send large streams of data to many hosts with a single transmission. The multicast packet uses special addressing at Layer 3 and Layer 2 to communicate with clients that have been configured to receive these packets. The multicast packet contains a Class D IP address to specify the group of devices that are to receive the packet. This group is known as the multicast group and the IP address translates directly to an Ethernet multicast address. The Ethernet multicast address has the first 24 bits set to 01-00-5E, the next bit is set to 0, and the last 23 bits set to match the low 23 bits of the IP multicast address. Figure I-1 shows how Layer 3 multicast addresses translate to Layer 2 Ethernet addresses.

Figure I-1. Layer 3-to-Layer 2 Multicast Translation

Well-known or assigned IP protocols are registered with the Internet Assigned Numbers Authority (IANA). The information presented here is reproduced with permission from the IANA. For the most current IP protocol number assignment information, refer to http://www.iana.org/ numbers .htm under the "Multicast Addresses" link.

"Host Extensions for IP Multicasting" [RFC 1112] specifies the extensions required for a host implementation of the Internet Protocol (IP) to support multicasting. The multicast addresses are in the range 224.0.0.0 “239.255.255.255. Table I-1 lists the current addresses.

The range of addresses between 224.0.0.0 and 224.0.0.255, inclusive is reserved for the use of routing protocols and other low-level topology discovery or maintenance protocols, such as gateway discovery and group membership reporting. Multicast routers should not forward any multicast datagram with destination addresses in this range, regardless of its TTL.

Table I-1 shows the registered multicast addresses, along with the application, and the RFC number (if applicable ) or other reference.

Table I-1. Registered Multicast Addresses and Associated Applications, RFCs, and References

Group, Application, and References	Address
Base Address (Reserved) RFC 1112	224.0.0.0
All Systems on this Subnet RFC 1112	224.0.0.1
All Routers on this Subnet	224.0.0.2
Unassigned	224.0.0.3
DVMRP Routers RFC 1075	224.0.0.4
OSPFIGP OSPFIGP All Routers RFC 2328	224.0.0.5
OSPFIGP OSPFIGP Designated Routers RFC 2328	224.0.0.6
ST Routers RFC 1190	224.0.0.7
ST Hosts RFC 1190	224.0.0.8
RIP-2 Routers RFC 1723	224.0.0.9
EIGRP Routers	224.0.0.10
Mobile-Agents	224.0.0.11
DHCP Server/Relay Agent RFC 1884	224.0.0.12
All PIM Routers	224.0.0.13
RSVP-ENCAPSULATION	224.0.0.14
all-cbt-routers	224.0.0.15
designated-sbm	224.0.0.16
all-sbms	224.0.0.17
VRRP	224.0.0.18
IPAllL1ISs	224.0.0.19
IPAllL2ISs	224.0.0.20
IPAllIntermediate Systems	224.0.0.21
IGMP	224.0.0.22
GLOBECAST-ID	224.0.0.23
Unassigned	224.0.0.24
router-to-switch	224.0.0.25
Unassigned	224.0.0.26
Al MPP Hello	224.0.0.27
ETC Control	224.0.0.28
GE-FANUC	224.0.0.29
indigo-vhdp	224.0.0.30
shinbroadband	224.0.0.31
digistar	224.0.0.32
ff-system-management	224.0.0.33
pt2-discover	224.0.0.34
DXCLUSTER	224.0.0.35
DTCP Announcement	224.0.0.36
Unassigned	224.0.0.37 “224.0.0.250
MDNS	224.0.0.251
Unassigned	224.0.0.252 “224.0.0.255
VMTP Managers Group RFC 1045	224.0.1.0
NTP (Network Time Protocol) RFC 1119	224.0.1.1
SGI-Dogfight	224.0.1.2
Rwhod	224.0.1.3
VNP	224.0.1.4
Artificial Horizons “ Aviator	224.0.1.5
NSS “ Name Service Server	224.0.1.6
AUDIONEWS “ Audio News Multicast	224.0.1.7
SUN NIS+ Information Service	224.0.1.8
MTP (Multicast Transport Protocol)	224.0.1.9
IETF-1-LOW-AUDIO	224.0.1.10
IETF-1-AUDIO	224.0.1.11
IETF-1-VIDEO	224.0.1.12
IETF-2-LOW-AUDIO	224.0.1.13
IETF-2-AUDIO	224.0.1.14
IETF-2-VIDEO	224.0.1.15
MUSIC-SERVICE	224.0.1.16
SEANET-TELEMETRY	224.0.1.17
SEANET-IMAGE	224.0.1.18
MLOADD	224.0.1.19
any private experiment	224.0.1.20
DVMRP on MOSPF	224.0.1.21
SVRLOC	224.0.1.22
XINGTV	224.0.1.23
microsoft-ds	224.0.1.24
nbc-pro	224.0.1.25
nbc-pfn	224.0.1.26
lmsc-calren-1	224.0.1.27
lmsc-calren-2	224.0.1.28
lmsc-calren-3	224.0.1.29
lmsc-calren-4	224.0.1.30
ampr- info	224.0.1.31
Mtrace	224.0.1.32
RSVP-encap-1	224.0.1.33
RSVP-encap-2	224.0.1.34
SVRLOC-DA	224.0.1.35
rln-server	224.0.1.36
proshare-mc	224.0.1.37
Dantz	224.0.1.38
cisco-rp-announce	224.0.1.39
cisco-rp-discovery	224.0.1.40
Gatekeeper	224.0.1.41
Iberiagames	224.0.1.42
nwn-discovery	224.0.1.43
nwn-adaptor	224.0.1.44
isma-1	224.0.1.45
isma-2	224.0.1.46
telerate	224.0.1.47
Ciena	224.0.1.48
dcap-servers RFC 2114	224.0.1.49
dcap-clients RFC 2114	224.0.1.50
Mcntp-directory	224.0.1.51
Mbone-vcr-directory	224.0.1.52
Heartbeat	224.0.1.53
sun-mc-grp	224.0.1.54
extended-sys	224.0.1.55
pdrncs	224.0.1.56
tns-adv-multi	224.0.1.57
Vcals-dmu	224.0.1.58
Zuba	224.0.1.59
hp-device-disc	224.0.1.60
tms-production	224.0.1.61
Sunscalar	224.0.1.62
mmtp-poll	224.0.1.63
compaq-peer	224.0.1.64
Iapp	224.0.1.65
multihasc-com	224.0.1.66
serv-discovery	224.0.1.67
Mdhcpdisover RFC 2730	224.0.1.68
MMP-bundle-discovery1	224.0.1.69
MMP-bundle-discovery2	224.0.1.70
XYPOINT DGPS Data Feed	224.0.1.71
GilatSkySurfer	224.0.1.72
SharesLive	224.0.1.73
NorthernData	224.0.1.74
SIP	224.0.1.75
IAPP	224.0.1.76
AGENTVIEW	224.0.1.77
Tibco Multicast1	224.0.1.78
Tibco Multicast2	224.0.1.79
MSP	224.0.1.80
OTT (One-way Trip Time)	224.0.1.81
TRACKTICKER	224.0.1.82
dtn-mc	224.0.1.83
jini-announcement	224.0.1.84
jini-request	224.0.1.85
sde-discovery	224.0.1.86
DirecPC-SI	224.0.1.87
B1Rmonitor	224.0.1.88
3Com-AMP3 Drmon	224.0.1.89
ImFtmSvc	224.0.1.90
NQDS4	224.0.1.91
NQDS5	224.0.1.92
NQDS6	224.0.1.93
NLVL12	224.0.1.94
NTDS1	224.0.1.95
NTDS2	224.0.1.96
NODSA	224.0.1.97
NODSB	224.0.1.98
NODSC	224.0.1.99
NODSD	224.0.1.100
NQDS4R	224.0.1.101
NQDS5R	224.0.1.102
NQDS6R	224.0.1.103
NLVL12R	224.0.1.104
NODS1R	224.0.1.105
NODS2R	224.0.1.106
NODSAR	224.0.1.107
NODSBR	224.0.1.108
NODSCR	224.0.1.109
NODSDR	224.0.1.110
MRM	224.0.1.111
TVE-FILE	224.0.1.112
TVE-ANNOUNCE	224.0.1.113
Mac Srv Loc	224.0.1.114
Simple Multicast	224.0.1.115
SpectraLinkGW	224.0.1.116
Dieboldmcast	224.0.1.117
Tivoli Systems	224.0.1.118
pq-lic- mcast	224.0.1.119
HYPERFEED	224.0.1.120
Pipesplatform	224.0.1.121
LiebDevMgmg-DM	224.0.1.122
TRIBALVOICE	224.0.1.123
Unassigned (Retracted 1/29/01)	224.0.1.124
PolyCom Relay1	224.0.1.125
Infront Multi1	224.0.1.126
XRX DEVICE DISC	224.0.1.127
CNN	224.0.1.128
PTP-primary	224.0.1.129
PTP-alternate1	224.0.1.130
PTP-alternate2	224.0.1.131
PTP-alternate3	224.0.1.132
ProCast	224.0.1.133
3Com Discp	224.0.1.134
CS-Multicasting	224.0.1.135
TS-MC-1	224.0.1.136
Make Source	224.0.1.137
Teleborsa	224.0.1.138
SUMAConfig	224.0.1.139
Unassigned	224.0.1.140
DHCP-SERVERS	224.0.1.141
CN Router-LL	224.0.1.142
EMWIN	224.0.1.143
Alchemy Cluster	224.0.1.144
Satcast One	224.0.1.145
Satcast Two	224.0.1.146
Satcast Three	224.0.1.147
Intline	224.0.1.148
8x8 Multicast	224.0.1.149
Unassigned	224.0.1.150
Intline-1	224.0.1.151
Intline-2	224.0.1.152
Intline-3	224.0.1.153
Intline-4	224.0.1.154
Intline-5	224.0.1.155
Intline-6	224.0.1.156
Intline-7	224.0.1.157
Intline-8	224.0.1.158
Intline-9	224.0.1.159
Intline-10	224.0.1.160
Intline-11	224.0.1.161
Intline-12	224.0.1.162
Intline-13	224.0.1.163
Intline-14	224.0.1.164
Intline-15	224.0.1.165
marratech-cc	224.0.1.166
EMS-InterDev	224.0.1.167
itb301	224.0.1.168
rtv-audio	224.0.1.169
rtv-video	224.0.1.170
HAVI-Sim	224.0.1.171
Nokia Cluster	224.0.1.172
Unassigned	224.0.1.173 “224.0.0.255
"rwho" Group (BSD) ( unofficial )	224.0.2.1
SUN RPC PMAPPROC_CALLIT	224.0.2.2
SIAC MDD Service	224.0.2.64 “224.0.2.95
CoolCast	224.0.2.96 “224.0.2.127
WOZ-Garage	224.0.2.128 “224.0.2.191
SIAC MDD Market Service	224.0.2.192 “224.0.2.255
RFE Generic Service	224.0.3.0 “224.0.3.255
RFE Individual Conferences	224.0.4.0 “224.0.4.255
CDPD Groups	224.0.5.0 “224.0.5.127
SIAC Market Service	224.0.5.128 “224.0.5.191
Unassigned IANA	224.0.5.192 “224.0.5.255
Cornell ISIS Project	224.0.6.0 “224.0.6.127
Unassigned IANA	224.0.6.128 “224.0.6.255
Where-Are-You	224.0.7.0 “224.0.7.255
INTV	224.0.8.0 “224.0.8.255
Invisible Worlds	224.0.9.0 “224.0.9.255
DLSw Groups	224.0.10.0 “224.0.10.255
NCC.NET Audio	224.0.11.0 “224.0.11.255
Microsoft and MSNBC	224.0.12.0 “224.0.12.63
UUNET PIPEX Net News	224.0.13.0 “223.0.13.255
NLANR	224.0.14.0 “224.0.14.255
Hewlett Packard	224.0.15.0 “224.0.15.255
XingNet	224.0.16.0 “224.0.16.255
Mercantile & Commodity Exchange	224.0.17.0 “224.0.17.31
NDQMD1	224.0.17.32 “224.0.17.63
ODN-DTV	224.0.17.64 “224.0.17.127
Dow Jones	224.0.18.0 “224.0.18.255
Walt Disney Company	224.0.19.0 “224.0.19.63
Cal Multicast	224.0.19.64 “224.0.19.95
SIAC Market Service	224.0.19.96 “224.0.19.127
IIG Multicast	224.0.19.128 “224.0.19.191
Metropol	224.0.18.192 “224.0.19.207
Xenoscience, Inc.	224.0.19.208 “224.0.19.239
HYPERFEED	224.0.19.240 “224.0.19.255
MS-IP/TV	224.0.20.0 “224.0.20.63
Reliable Network Solutions	224.0.20.64 “224.0.20.127
TRACKTICKER Group	224.0.20.128 “224.0.20.143
CNR Rebroadcast MCA	224.0.20.144 “224.0.20.207
Talarian MCAST	224.0.21.0 “224.0.21.127
WORLD MCAST	224.0.22.0 “224.0.22.255
Domain Scoped Group	224.0.252.0 “224.0.252.255
Report Group	224.0.253.0 “224.0.253.255
Query Group	224.0.254.0 “224.0.254.255
Border Routers	224.0.255.0 “224.0.255.255
ST Multicast Groups RFC 1190	224.1.0.0 “224.1.255.255
Multimedia Conference Calls	224.2.0.0 “224.2.127.253
SAPv1 Announcements	224.2.127.254
SAPv0 Announcements (deprecated)	224.2.127.255
SAP Dynamic Assignments	224.2.128.0 “224.2.255.255
DIS transient groups	224.252.0.0 “224.255.255.255
MALLOC (temp - renew 1/01)	225.0.0.0 “225.255.255.255
VMTP transient groups	232.0.0.0 “232.255.255.255
Static Allocations (temp - renew 03/02)	233.0.0.0 “233.255.255.255
Administratively Scoped IANA, RFC 2365	239.0.0.0 “239.255.255.255
Reserved IANA	239.0.0.0 “239.63.255.255
Reserved IANA	239.64.0.0 “239.127.255.255
Reserved IANA	239.128.0.0 239.191.255.255
Organization-Local Scope RFC 2365	239.192.0.0 “239.251.255.255
Site-Local Scope (reserved) RFC 2365	239.252.0.0 “239.252.255.255
Site-Local Scope (reserved) RFC 2365	239.253.0.0 “239.253.255.255
Site-Local Scope (reserved) RFC 2365	239.254.0.0 “239.254.255.255
Site-Local Scope RFC 2365	239.255.0.0 “239.255.255.255
Rasadv	239.255.2.2