![]() Multicast (and broadcast) MAC addresses are destination addresses. Significant three bytes of the MAC address) available into which to encode the IP address.Īctually, it is even worse than this.only the lower 23 bits are available for use (for The astute reader may have noticed a problem by now: There are only 24 bits (the least If we ignore the four most significant bits of the multicast IP address (which,Īs noted earlier, will always be "1110"), that leaves 28 bits of IP address information which Traffic, we would ideally like a one-to-one mapping between multicast IP addresses and multicast Since it is obviously infeasible to have an equivalent of ARP when transmitting multicast If you aren't interested and reading this but just need to do a conversion you can skip ahead to the Address Converter Tool. The MAC address assigned to an interface must be a unicast MAC address because it is used as the source address for frames sent from the device, and a source MAC address must be a unicast address. Significant 9 bits of the multicast IP address are quite simply ignored and the remainingĢ3 bits are copied into the lowest 23 bits of the MAC address.Īs a consequence of this, 5 bits of "useful" IP address information being scrapped, there is Non-technical reasons which need not detain us here). Not a one-to-one mapping between multicast IP address and multicast MAC addresses. Rather,Įach multicast MAC address will be shared by 32 IP addresses. When using IPv4, the multicast MAC address is a special value that begins with 01-00-5E in hexadecimal. This has implications for multicast application design. Online converter from MAC address to IPv6 and from IPv6 to MAC address. ![]()
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