An Organizationally Unique Identifier is the IEEE-assigned prefix of a MAC address. MA-L uses 24 bits. Smaller MA-M and MA-S blocks use 28 or 36 bits. This tool matches the longest prefix in the public IEEE listings.

Can this find a phone or laptop on a map?

No. A MAC address does not include GPS location. The lookup only names the organization that registered the prefix, when one exists.

Why is my MAC unknown or locally administered?

Phones often randomize Wi-Fi MACs. Those addresses set the locally administered bit and are not in the IEEE vendor list. Virtual machines and some USB adapters also use local addresses.

Where does the vendor data come from?

Public IEEE Registration Authority listings (MA-L, MA-M, MA-S, CID). The list is downloaded into the page; the MAC you type is not sent to our servers.

MAC Address Lookup

Look up the IEEE vendor (OUI) for a MAC address

Last updated: September 16, 2026

MAC Address

Supported formats: XX:XX:XX:XX:XX:XX, XX-XX-XX-XX-XX-XX, XXXXXXXXXXXX

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How to use

Enter a MAC address in colon, hyphen, or bare hex form.
The lookup uses IEEE MA-L, MA-M, and MA-S assignments loaded in your browser.
This identifies a manufacturer prefix. It does not locate a device on a map.

About MAC Addresses

A MAC address is a 48-bit hardware identifier. The first bits are assigned by IEEE as an OUI or a smaller MA-M / MA-S block. The rest is device-specific. Randomized Wi-Fi addresses set the locally administered bit and often have no vendor.

Result actions

Copy or download the tool output, or share a link to MAC Address Lookup.

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What MAC address lookup does

The first bits of a MAC address are assigned by the IEEE Registration Authority. Looking them up names the organization that registered that prefix — often the NIC or device maker. It does not identify a person or a street address.

Prefix sizes

Registry	Prefix length	Typical use
MA-L (OUI)	24 bits	Large manufacturers
MA-M	28 bits	Medium blocks
MA-S	36 bits	Small blocks
CID	24 bits	Company ID, not always used as a MAC

The tool tries the longest matching prefix first, so an MA-S assignment wins over its MA-L parent.

Locally administered addresses

Bit 1 of the first octet is the U/L bit. When it is set, the address is locally administered or randomized (common on modern phones). Vendor lookup usually fails, and that is expected.

What this is not

This is not "find my phone," MAC-from-IP, or a law-enforcement tracker. Searches like "find MAC address on Android" are about reading the address on the device, which this page does not do.

Privacy

The IEEE list is loaded as a static file. The address you enter is matched in your browser and is not uploaded.

FAQ

What is an OUI?: An Organizationally Unique Identifier is the IEEE-assigned prefix of a MAC address. MA-L uses 24 bits. Smaller MA-M and MA-S blocks use 28 or 36 bits. This tool matches the longest prefix in the public IEEE listings.
Can this find a phone or laptop on a map?: No. A MAC address does not include GPS location. The lookup only names the organization that registered the prefix, when one exists.
Why is my MAC unknown or locally administered?: Phones often randomize Wi-Fi MACs. Those addresses set the locally administered bit and are not in the IEEE vendor list. Virtual machines and some USB adapters also use local addresses.
Where does the vendor data come from?: Public IEEE Registration Authority listings (MA-L, MA-M, MA-S, CID). The list is downloaded into the page; the MAC you type is not sent to our servers.