MAC Address Lookup
Look up the hardware vendor behind a MAC address by resolving its OUI prefix (the first three bytes) against the IEEE registry. Accepts full or partial addresses in any separator style.
Input
Full or partial. Colons, hyphens, periods or no separator at all — only the first three bytes (the OUI) are looked up.
Output
| Property | Value |
|---|---|
| No data yet | |
Guides
Find out which manufacturer made a device from its MAC address. Paste a full or partial address and this lookup resolves its OUI — the first three bytes — against the IEEE registry of nearly 40,000 vendor assignments, returning the organization the block belongs to. Handy for identifying unknown devices on your network, auditing DHCP leases, and triaging ARP tables or Wi-Fi scans.
How to use it
- Paste a MAC address into the MAC Address field.
00:23:AB:7B:58:99,00-23-AB-7B-58-99,0023.AB7B.5899and0023AB7B5899all work. - Click Look up vendor.
- Read the vendor name, or copy the details table (MAC address, OUI prefix, vendor) as CSV.
You only need the first three bytes — 00:23:AB on its own is enough for a lookup, since the remaining bytes are the manufacturer's own serial portion and say nothing about who made the device.
What is an OUI?
An OUI (Organizationally Unique Identifier) is the 24-bit prefix the IEEE assigns to a hardware manufacturer. Every MAC address begins with one, so those first six hex digits act as a fingerprint for the vendor: 3C:15:C2 is Apple, 00:23:AB is Cisco. The IEEE publishes the full MA-L registry, which is what this tool bundles and searches.
Why does my address say "Vendor not found"?
Three common reasons:
- It is a randomized (private) MAC. Modern phones and laptops rotate a random MAC per Wi-Fi network to prevent tracking. These use a locally administered address, which belongs to no vendor. You can spot one by the second hex digit:
2,6,AorE(as inA2:…,7E:…) means locally administered. - The block is registered but withheld. Some companies pay the IEEE to keep the assignment private; those rows read as "Private".
- The block is newer than this snapshot. The registry is bundled with the tool as a point-in-time copy, so a very recent assignment may be missing.
Can I look up a MAC address without an internet connection?
Yes — that is the point of bundling the registry. The whole IEEE MA-L list ships with the tool and the lookup is a local table read, so nothing is sent to any server and no third-party API is called.
Does the vendor tell me what the device is?
It tells you who made the network chipset, which is often but not always the device brand — plenty of consumer hardware ships with a Realtek, Intel or Broadcom radio inside. Read it as a strong hint, not proof.
Is my data private?
Yes. The address you paste never leaves your browser; the entire lookup runs client-side against the bundled dataset.