Try the MAC Address Lookup & Formatter
Paste a MAC address to validate its format, see it reformatted in colon, hyphen and dot notation, and look up the likely hardware vendor from its OUI prefix.
- Free to use
- No signup
- Nothing to install
- Runs in your browser
3C:22:FB:12:34:56 -> valid MAC, OUI 3C:22:FB matches Apple, Inc. in the curated vendor list; reformatted as 3C-22-FB-12-34-56 and 3c22.fb12.3456.Open the MAC Address Lookup & Formatter
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See it in action
The MAC Address Lookup & Formatter with sample data entered and the result showing.
What is the MAC Address Lookup & Formatter?
A MAC address is the physical hardware identifier burned into every network interface — its first three bytes, called the OUI (Organizationally Unique Identifier), are officially registered by the device's manufacturer with the IEEE. Paste a MAC address and this tool validates that it's correctly formatted (12 hex characters, in pairs), reformats it instantly into colon (00:1A:2B:...), hyphen (00-1A-2B-...) and dot (001A.2B3C...) notation, and looks up the OUI against a curated list of well-known vendor prefixes.
Being upfront about scope: the vendor list covers a substantial curated set of common, well-known manufacturers (major networking, computer and phone brands) rather than the IEEE's entire public registry of tens of thousands of assigned blocks, so an unrecognized prefix means "not in this tool's curated list" rather than "not a real vendor" — for a full authoritative lookup on an unrecognized prefix, the IEEE's own public OUI registry is the definitive source. The tool also generates a random, properly formatted test MAC address for lab or documentation use.
3 steps to your result
Open the tool and follow along. Nothing to install.
What you get
Confirms a MAC is valid and reformats it into colon, hyphen or dot notation instantly.
Identifies the likely manufacturer for well-known OUI prefixes.
Creates a properly formatted, locally-administered test address for labs and documentation.
Clearly distinguishes "not in this list" from "not a real vendor".
AZRS tools are free to open and use.
It opens in your browser, so there is nothing to download.
Used for
Pick one to see how it fits.
Network administrators
Quickly identify what kind of device a MAC address on the network likely belongs to.
Try it freeDevelopers and QA engineers
Validate a MAC address field's format or generate a safe test address for documentation.
Try it freeIT support staff
Convert between colon and hyphen notation to match what a particular tool or vendor's interface expects.
Try it freeHow it compares
A plain look at this tool next to the usual alternative.
| This utility | Desktop software | |
|---|---|---|
| Install | Nothing to install | Usually an app or program to install |
| Account | No signup | Depends on the product |
| Cost | Free to use | Free or paid, depends on the product |
| Where it runs | In your browser tab | On your computer |
Questions people ask
What is a MAC address?
A hardware identifier assigned to a network interface, made of 6 bytes (12 hex characters) — the first three bytes (the OUI) officially identify the manufacturer, registered with the IEEE.
Why doesn't it recognize my device's vendor?
Either the OUI isn't in this tool's curated list of common vendors (check the IEEE's full public registry for a complete answer), or the address is a locally-administered/randomized one, which many modern phones use for privacy and never map to a real manufacturer.
What's a locally-administered MAC address?
A MAC address with a specific bit set in its first byte indicating it was assigned locally rather than burned in by a manufacturer — commonly used for the randomized addresses modern devices use for network privacy.
Can I convert between colon and hyphen notation?
Yes, entering a MAC in any common format instantly shows it reformatted in colon, hyphen and dot notation.
Is my MAC address sent anywhere?
No, validation, formatting and vendor lookup all happen locally in your browser against a bundled list.
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Try the MAC Address Lookup & Formatter now
Validate a MAC address, reformat it, and look up its likely hardware vendor from its OUI. Free to use.
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