MAC Vendor Lookup

How to use it

1. Paste a MAC address in any format: 00:1B:63:84:45:E6, 00-1B-63-84-45-E6, 001b.6384.45e6, or even a bare hex string.
2. The tool strips separators and shows the normalized XX:XX:XX:XX:XX:XX form.
3. The vendor card matches the first three bytes against the built-in OUI table of about 40 common vendors.
4. The flags card reports the unicast/multicast bit and the universal/local administration bit.
5. If the prefix is not in the table, the result honestly says "unknown" — it does not guess.

Common use cases

• Identifying devices on a router — turning a client list of MACs into brand names to find unknown hardware.
• Checking virtual machines — recognizing VMware, Hyper-V, QEMU or VirtualBox prefixes in a network.
• Cleaning up inventories — normalizing MACs written in mixed formats into one canonical form.
• Spotting spoofed addresses — locally-administered bits on a "laptop" are worth a second look.

Why it stays private

The OUI table ships with the page and matching is a six-character lookup in your browser. There is no online API call — the result works with the network disconnected, and no address you type ever leaves the page.

FAQ

Q: How complete is the vendor table? A: It is a curated table of about 40 widely seen vendors, not the full IEEE registry. Unlisted prefixes are shown as unknown instead of a wrong guess.

Q: Why does my device show "unknown" even though it is a known brand? A: Large vendors own many OUI blocks, and the built-in table only carries a few common ones per vendor. Also, locally-administered addresses deliberately avoid vendor prefixes.

Q: Can I enter a partial MAC? A: Yes — the first three bytes (six hex digits) are enough for an OUI lookup and flag detection. Anything shorter than six digits is rejected.