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MAC Vendor Lookup

Match a MAC address to the organization that registered its prefix, or see that the address is locally administered and has no vendor.

This check runs on our server. The address you enter is used only for this check and is not stored.
Updated

This check runs on our server. The address you enter is used only for this check and is not stored.

How to use MAC Vendor Lookup

  1. Paste a MAC address.
  2. Tick the robot check and press Check.
  3. Read the organization, or the note that the address is locally administered.

How it works

This check runs on our server. The address is not stored, and it is not sent to another site.

The first bits are compared with the IEEE assignment list shipped with the site. A 24-bit prefix is an MA-L assignment (the older OUI). Longer prefixes in the list are matched when the address falls in them. If the locally administered bit is set (the second hex digit is 2, 6, A, or E), the address was chosen by software or by a local administrator, and the list is not consulted.

Examples

  • A burned-in adapter address with a known prefix shows the organization that registered those bits.
  • An address whose second hex digit is 2, such as 02:11:22:33:44:55, is locally administered and has no vendor.
  • A multicast address (the least significant bit of the first octet is 1) is labeled multicast. The vendor lookup still runs only when the address is also globally unique.

Limitations

  • The result is only as new as the assignment file shipped with the site. A prefix assigned last week can be missing until that file is updated.
  • The organization name is who registered the prefix. It is not a promise about who owns the device now.
  • One address per check.

Frequently asked questions

Why is there no company for this address?

The locally administered bit is set, or the prefix is not in the file we ship.

Does this talk to the device?

No. The address is compared with a list.

Which formats can I paste?

Colons, hyphens, Cisco dots (0011.2233.4455), or twelve hex digits.

Often used together with the MAC Vendor Lookup.

  • IP to ASN

    ASN, network name, and registry for one public IPv4 or IPv6 address.

  • Whois Lookup

    Registrar, domain status, name servers, and dates from the registry's RDAP record.