MAC Address Converter
Reformat a MAC address for Windows, Linux or Cisco, check its unicast/multicast and local/global bits, and derive the EUI-64 IPv6 link-local address.
Windows shows 00-1A-2B-3C-4D-5E, Linux shows 00:1a:2b:3c:4d:5e and Cisco switches want 001a.2b3c.4d5e. Paste a MAC in any format and get all of them, plus the vendor prefix (OUI), whether the address is unicast or multicast, burned-in or locally administered (randomised), and the EUI-64 IPv6 link-local address the device will generate.
Where it helps
- Building DHCP reservations and switch port security entries in the right format.
- Searching a switch’s MAC table for a device you found in Windows
ipconfig /all. - Recognising randomised MACs (“locally administered”) from phones that change address per network.
Frequently asked questions
How is an EUI-64 interface ID made?
Split the MAC in half, insert ff:fe in the middle and flip the seventh bit (the universal/local bit). 00:1a:2b:3c:4d:5e becomes 021a:2bff:fe3c:4d5e.
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