uencoder

MAC Address Tool

Validate MAC addresses, convert between separator formats, toggle case, and look up vendor via OUI prefix. Free, private, and 100% client-side.

Local only

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How to use

  1. Enter a MAC address in any common format.
  2. Select the output separator format and case.
  3. View validation result, vendor, and format conversions.

Frequently asked questions

What MAC address formats are accepted?
Any format with 12 hex digits is accepted, including colon-separated (00:1A:2B:3C:4D:5E), hyphen-separated (00-1A-2B-3C-4D-5E), or no separator (001A2B3C4D5E).
How does vendor lookup work?
The first 3 bytes (OUI) are matched against a built-in table of common vendor prefixes. Not all vendors are included.

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