What separators are accepted as input?

Any — colons, dashes, dots, or none at all — as long as there are exactly 12 hex digits.

How complete is the vendor lookup?

It uses a small built-in table of common prefixes, not the full IEEE OUI registry, so many results will show 'Unknown vendor'.

What does the locally administered bit mean?

It indicates the MAC was assigned by software (e.g. a VM) rather than burned in by the hardware manufacturer.

Is my data uploaded to a server?

No. This tool runs entirely in your browser using standard web APIs, so your input never leaves your device and nothing is logged or stored on our servers.

Does it work offline and on mobile?

Yes. Once the page has loaded it keeps working without a network connection, and the layout is responsive so it stays usable on phones and tablets.

MAC Address Tools

Validate and reformat MAC addresses, and look up the OUI vendor prefix.

Support

Works Offline

Privacy First

No Login

No API

MAC address

Enter in any common notation

MAC address

Formatted variants

Common separator styles

Colon

00:1B:63:84:45:E6

Dash

00-1B-63-84-45-E6

Dot (Cisco)

001B.6384.45E6

OUI & vendor

Organizationally Unique Identifier lookup

OUI prefix

00:1B:63

Vendor

Apple

Multicast bit

Locally administered

OUI bytes

001B63

Vendor lookup uses a small built-in table of common prefixes and is not a full IEEE OUI database.

About the MAC Address Tools

Enter a MAC address in any common notation to validate it and see it reformatted with colons, dashes, or Cisco-style dots. Also shows the OUI (vendor prefix) bytes and a best-effort vendor name lookup.

Examples

Format MAC

001b6384 45e6

Output

00:1B:63:84:45:E6

Keyboard shortcuts

Copy the main outputCtrl / ⌘ + Shift + C
Download the resultCtrl / ⌘ + S
Share this toolCtrl / ⌘ + Shift + S
Reset the inputsAlt + R
Open the tool search paletteCtrl / ⌘ + K

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Frequently asked questions

Version 1.0.0 · Updated 2026-08-06 · Runs entirely in your browser