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MAC Address Validator

Validators

Validate MAC addresses for correct format and structure.

⚡ Instant🔒 Private, in your browser🆓 Free, no sign-up👥 For developers
Your data never leaves your browser. We do not store inputs.

What MAC Address Validator does

The MAC Address Validator checks whether a string is a correctly formatted MAC address — six pairs of hex digits, separated by colons, hyphens, or Cisco-style dots — and flags malformed input before it's added to a device allow-list or network configuration. The check runs entirely in your browser.

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Reviewed by the FreeToolsVerse team · Last updated · How we check our tools

How to use MAC Address Validator

  1. Enter the MAC address, in colon, hyphen, or dot-separated format
  2. The result appears instantly as you type
  3. See whether it's correctly formatted, plus its normalized form
  4. Fix and re-check if it's flagged invalid

Who should use it

Made for developers. Typical uses:

  • Checking a MAC address before adding it to a router's device allow-list
  • Validating MAC addresses in a bulk-imported asset inventory spreadsheet
  • Confirming a MAC address copied from a device label was transcribed correctly

Frequently asked questions

Is it free to use?
Yes, completely free.
Is my data sent anywhere?
No, format validation runs entirely in your browser.
What formats does it accept?
Colon-separated (AA:BB:CC:DD:EE:FF), hyphen-separated, and Cisco-style dotted-triplet notation.
Does it tell me the manufacturer from the address?
No — it checks formatting only. The first three octets (the OUI) do identify the manufacturer, but looking that up is outside what this tool does.
Is a MAC address the same as an IP address?
No — a MAC address identifies a network hardware interface at the link layer, while an IP address identifies a device's location on a network at a higher layer.

Learning resources

Explore more in Validators, read the guides and articles, or see how we test our tools.

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