MAC converter
Colon, hyphen, Cisco dotted, bare, EUI-64, bit-reversed and IPv6 link-local forms of one address.
Enter an address or choose an example.
What this tool does
The converter reads one anchored MAC format and shows its colon, hyphen, Cisco dotted and bare forms. A 48 bit address also yields EUI-64, modified EUI-64, IPv6 link-local and bit-reversed forms.
How it works
Raw EUI-64 inserts FF:FE in the middle of a 48 bit address. Modified EUI-64 also flips the U/L bit in the first octet, as IPv6 interface identifiers require. The link-local form places that modified identifier under fe80::/64. Bit reversal reverses the eight bits inside each octet; it is used when comparing Token Ring or FDDI representations.
How to read the result
The result names the input format, then lists each output with a copy button. An EUI-64 input cannot be turned into an original 48 bit address unless its middle octets are FF:FE; even then, the embedded address is only a candidate.
Limitations
Conversion changes notation or derives an interface identifier. It does not establish the maker or owner of a device. Input is matched against a complete format; unrelated characters are never removed to force a match.