MAC Format Converter

Convert a MAC address between the four notations, and read the two bits that matter.

What you provide

Any separator, or none. Colons, hyphens, dots or bare hex all work.

Result

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

The same address in the four notations different systems expect. The two bits worth reading are both in the first octet: the lowest bit distinguishes unicast from multicast, and the next one up marks a locally administered address. This one is universally administered, so the first three octets are the vendor identifier.

Diagnostic telemetry
Colon (Unix, IEEE)
00:1a:2b:3c:4d:5e
Hyphen (Windows)
00-1A-2B-3C-4D-5E
Dot (Cisco)
001a.2b3c.4d5e
Bare
001a2b3c4d5e
AdministrationBurned in by the manufacturer, so the first three octets identify the vendor.
Universally administered
CastThe least-significant bit of the first octet.
Unicast

What this cannot tell you

  • Formats and classifies. It does not look up the manufacturer — the OUI lookup tool does that, and only for universally administered addresses.
  • A locally administered address has no manufacturer to look up. Randomised Wi-Fi MACs are the common case and are deliberately meaningless.
  • Runs entirely in your browser. Nothing is looked up, transmitted or stored.

Take this with you

MAC Format Converter on RunTheTests — free browser-based netmath tools, no sign-up.