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MAC Address Formatter

Reformat a MAC address with colons, hyphens or Cisco dots, and see whether it's multicast or locally administered.

Any format: colons, hyphens, dots or none.

Result

Colon format

00:1a:2b:3c:4d:5e

Hyphen format (Windows)
00-1a-2b-3c-4d-5e
Dotted format (Cisco)
001a.2b3c.4d5e
Plain
001a2b3c4d5e
OUI (manufacturer prefix)
00:1a:2b
Type
Unicast
Administered
Universally (set by the manufacturer)

Runs in your browser — nothing you enter is sent to a server.

How the MAC Address Formatter works

A MAC address is 6 bytes (12 hex digits) that identify a network interface. Paste it in any common format and get it back with colons (Linux, macOS), hyphens (Windows) or Cisco's dotted groups, in upper or lower case. The tool also reads two flag bits in the first byte: whether the address is multicast and whether it was set locally rather than by the manufacturer.

Formula

first byte bit 0 = multicast; bit 1 = locally administered

The first three bytes (OUI) normally identify the manufacturer.

Examples

00-1A-2B-3C-4D-5E

Becomes 00:1a:2b:3c:4d:5e or 001a.2b3c.4d5e — a unicast, universally administered address with OUI 00:1a:2b.

02:00:00:00:00:01

The 02 first byte means locally administered — typical of virtual machines and randomized Wi-Fi addresses.

Frequently asked questions

Why does my phone show a different MAC on each network?

Modern phones use random, locally administered addresses per network for privacy.

Can I look up the manufacturer?

The OUI identifies it; manufacturer databases need an online lookup, which this private tool doesn't make.

What is ff:ff:ff:ff:ff:ff?

The broadcast address — frames sent to it reach every device on the local network.

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