MAC ADDRESS LOOKUP

Identify the manufacturer of any device by its MAC address or OUI prefix. Supports batch lookups (comma-separated).

MAC Address or OUI

Try:

About OUI Lookup

The first three octets of a MAC address form the OUI (Organizationally Unique Identifier). The IEEE assigns OUI blocks to manufacturers, making it possible to identify a device's vendor from its MAC address.

Input Formats

AA:BB:CC:DD:EE:FF — full MAC, colon-separated
AA-BB-CC-DD-EE-FF — full MAC, hyphen-separated
AABB.CCDD.EEFF — Cisco dot notation
AA:BB:CC — OUI prefix only (3 octets)
AABBCC — raw hex OUI (6 characters)

Batch Lookups

Separate multiple MAC addresses with commas to look up up to 20 at once. Useful for auditing a network scan or DHCP lease list.

Privacy Note

MAC addresses are looked up against a local copy of the IEEE OUI registry — no data is sent to third parties.