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MAC Address Format Converter

Paste a MAC address and pick the output format.

How it is calculated

A MAC address is 12 hexadecimal digits (48 bits); only the punctuation differs between notations. The tool upper-cases the input, deletes every character that is not 0-9 or A-F (colons, hyphens, dots, spaces), and requires exactly 12 digits to remain; otherwise it returns nothing. It then regroups them: colon as six pairs AA:BB:CC:DD:EE:FF, hyphen as AA-BB-CC-DD-EE-FF, dot as three groups of four AABB.CCDD.EEFF (Cisco style), or bare with no separators. Colon is used when no format is chosen. The result also lists the bare 12-digit form and the OUI, the first six digits, which identify the manufacturer's block. The tool does not look up the vendor name, and it always outputs capital letters.

Worked example

You have 00-1a-2b-3c-4d-5e from a Windows listing and need the dotted form for a switch. Step 1: upper-case it and remove the hyphens, giving 001A2B3C4D5E (12 digits, so valid). Step 2: split into groups of four: 001A, 2B3C, 4D5E. Step 3: join with dots to get 001A.2B3C.4D5E. The bare form is 001A2B3C4D5E, and the OUI, the first six digits, is 001A2B. Choosing colon instead would give 00:1A:2B:3C:4D:5E.

Try this example →

Common mistakes

  • Pasting an address with a prefix like 0x. The 0 counts as a digit, so the total becomes 13 and the tool returns no result; remove the prefix first.
  • Typing the letter O for zero or other non-hex letters. Characters outside 0-9 and A-F are silently dropped, leaving too few digits, so the address is rejected.
  • Pasting a longer identifier, such as an EUI-64 (16 digits) or an IPv6 interface ID. Only 48-bit MAC addresses of exactly 12 digits are accepted.
  • Assuming the OUI names the vendor. The tool only shows the first six digits; you must look them up in the IEEE registry yourself.
  • Expecting the letter case to carry meaning. Hex digits are case-insensitive, and the output is always upper-case even if the device shows lower-case.

About this calculator

A MAC (Media Access Control) address is the 48-bit hardware identifier burned into every network interface — Ethernet cards, Wi-Fi chips, Bluetooth radios. Different vendors and platforms write the same 12 hex digits differently: colon-separated (00:1A:2B:3C:4D:5E) is common on Linux and most networking gear, hyphen-separated on Windows, and Cisco devices use dotted groups of four (001A.2B3C.4D5E).

This converter normalizes a MAC address between those notations and also pulls out its OUI (Organizationally Unique Identifier) — the first 24 bits, which IEEE assigns to the manufacturer, so the OUI alone can identify whether a device is made by, say, Apple, Cisco, or Intel. Useful for network administrators comparing device logs, configuring ACLs, or troubleshooting hardware across mixed-vendor environments.

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Comments (1)

  • Editorial team

    The first six digits are the vendor block only when the address is globally assigned. If the second hex digit is 2, 6, A or E, the address is locally administered, which is how randomised Wi-Fi addresses on phones look, and it will not match a manufacturer. Which format do you most often need to paste into: a switch, a router or a spreadsheet?

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