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Multicast
FeIix edited this page Sep 27, 2026
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| Layer | Address Range | Notes |
|---|---|---|
| Layer 3 | 224.0.0.0 - 239.255.255.255 | The first 4-bit is 1110. |
| Layer 2 | 01:00:5E:00:00:00 - 01:00:5E:7F:FF:FF | The lower 4-bit of the first byte is 1; The 25th bit is 0. |
| Designation | Multicast Address Range |
|---|---|
| Local network control | 224.0.0.0/24 |
| Internetwork control | 224.0.1.0/24 |
| Ad hoc | 224.0.2.0 - 224.0.255.255 224.3.0.0 - 224.4.255.255 233.252.0.0 - 233.255.255.255 |
| Source Specific Multicast | 232.0.0.0/8 |
| GLOP | 233.0.0.0 - 233.251.255.255 |
| Private usage | 239.0.0.0/8 |
Private usage is like private IPv4 addresses, 192.168.0.0/16.
A multicast IP maps to a multicast MAC: The lower 23 bits of multicast MAC address are copied from the lower 23 bits of multicast IP.
| Multicast IP | Multicast MAC | Multicast Group | ||
|---|---|---|---|---|
| 224.0.0 | .1 | 01:00:5E:00:00 | :01 | All hosts |
| .2 | :02 | All routers | ||
| .5 | :05 | All OSPF routers | ||
| .6 | :06 | All OSPF DRs | ||
| .9 | :09 | All RIPv2 routers | ||
| .10 | :10 | All EIGRP routers | ||
| .13 | :13 | All PIM routers | ||
| .18 | :18 | VRRP | ||
| .22 | :22 | IGMPv3 | ||
| .102 | :66 | HSRPv2 and GLBP | ||
| 224.0.1 | .1 | :1 | NTP | |
| .39 | :39 | Cisco-RP-Announce | ||
| .40 | :40 | Cisco-RP-Discovery | ||