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MAC Address Formatter
Normalize a six-byte MAC address into colon, hyphen, dotted and bare forms and inspect its first-byte flags.
Colon, hyphen, three dotted hex groups or bare hexadecimal
JSON normalized MAC report
Browser only
Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.
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How to use this tool
- Enter MAC address in one supported notation.
- Select Format MAC address.
- Download mac-address.json for every normalized form and bit-pattern flag.
Examples
AABB.CCDD.EEFF normalizes to aa:bb:cc:dd:ee:ff and the corresponding hyphen, dotted and bare lowercase forms.
Limitations
- 64 input UTF-16 units, exactly six bytes, 64 KiB report and 30 seconds.
- Outer whitespace may be trimmed. Mixed separators, internal spaces, 0x prefixes and nonhexadecimal octets are rejected.
- No EUI-64, IPv6 derivation, OUI/vendor database, live hardware lookup or operational validity certification.
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