MAC Address Lookup & Formatter
Validate a MAC address, reformat it, and look up its likely hardware vendor from its OUI prefix · free, no signup
How MAC Address Lookup & Formatter works, step by step
Paste a MAC address in any common format.
Download itSee it validated and reformatted into colon, hyphen and dot notation.
Free 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.
Key features
Format validation and conversion
Confirms a MAC is valid and reformats it into colon, hyphen or dot notation instantly.
Curated vendor lookup
Identifies the likely manufacturer for well-known OUI prefixes.
Random test MAC generator
Creates a properly formatted, locally-administered test address for labs and documentation.
Honest about coverage
Clearly distinguishes "not in this list" from "not a real vendor".
How to use it
- Paste a MAC address in any common format.
- See it validated and reformatted into colon, hyphen and dot notation.
- Check the likely vendor looked up from its OUI prefix.
- Or click Generate for a random test MAC address.
Worked example
Example
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.
Who uses this tool
Network administrators
Quickly identify what kind of device a MAC address on the network likely belongs to.
Developers and QA engineers
Validate a MAC address field's format or generate a safe test address for documentation.
IT support staff
Convert between colon and hyphen notation to match what a particular tool or vendor's interface expects.
Tips for the best results
- An unrecognized OUI doesn't mean the address is invalid — it just isn't in this tool's curated common-vendor list; check the IEEE's full public registry for a complete, authoritative answer.
- A locally-administered MAC address (used for randomized/private addresses on modern phones and laptops for privacy) will never match a real manufacturer OUI, by design — that's expected, not an error.
- Different systems expect different separators (colon vs hyphen vs dot) — use the reformatted version that matches what you're pasting it into.
Common mistakes to avoid
- Assuming an unrecognized vendor means the MAC address itself is invalid or fake — it may simply be a real vendor not in this tool's curated subset, or a deliberately randomized privacy address.
- Mixing up MAC address format expectations between systems, like pasting colon-separated notation where a tool strictly expects hyphens.
- Treating a generated random test MAC as if it belongs to a real, traceable device — it's a locally-administered address meant purely for testing and documentation.
Why use AZRS QuickFix?
It is 100% free, needs no signup and has no watermark or usage limits. The tool runs in your browser, so what you type stays on your device, and it works on phones, tablets and desktops. New tools are added every week — bookmark this page or browse the full QuickFix toolbox.
Frequently asked questions
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.
Is this free?
Yes, unlimited lookups, no signup.