Multicast MAC Address Mapper
Map an IPv4 (224.0.0.0/4) or IPv6 (ff00::/8) multicast address to its Ethernet multicast MAC, and reverse a multicast MAC to every IP group it could carry.
This tool handles input and primary processing in your browser and is designed not to send the input to QuickKit’s server.
Mapping
| Family / standard | — |
|---|---|
| Multicast IP group | — |
| Ethernet MAC address | — |
| Bit mapping | — |
| Ambiguity | — |
Candidate multicast groups
How it works
Maps an IPv4 multicast group (224.0.0.0/4) to its Ethernet MAC with RFC 1112 (01:00:5e + the low 23 bits of the group), and an IPv6 multicast address (ff00::/8) with RFC 2464 (33:33 + the low 32 bits of the address). The IP → MAC direction is exact. The reverse direction is fundamentally many-to-one: every IPv4 multicast MAC is shared by 32 groups (all listed here), and every IPv6 multicast MAC is shared by roughly 2^80 addresses, so no unique reverse answer exists. Non-multicast input is rejected. All computation runs locally in your browser.