MAC Address Formatter
Paste a MAC address in any format to reformat it and see its OUI prefix.
Normalise any MAC address
MAC addresses show up in colon, hyphen, and Cisco dotted notation, and switching between them by hand is error-prone. Paste a MAC in any style and this reformats it into every common form at once.
aabbccddeeff becomes AA:BB:CC:DD:EE:FF, AA-BB-CC-DD-EE-FF, and aabb.ccdd.eeff, and the tool highlights AA:BB:CC as the OUI — the vendor prefix you can look up in the IEEE registry.
Flexible and private
It ignores whatever separators you paste and only needs twelve hex digits, and the whole thing runs in your browser with nothing uploaded.
Frequently Asked Questions
Which formats does it output?
Colon-separated (AA:BB:CC:DD:EE:FF), hyphen-separated, and Cisco dotted (aabb.ccdd.eeff), in both upper and lower case.
What is the OUI?
The first three bytes identify the manufacturer (the Organizationally Unique Identifier). The tool shows those bytes; look them up in the IEEE registry for the vendor name.
Does it accept messy input?
Yes — it strips any separators and just needs 12 hexadecimal digits, however they are grouped.
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