MAC Address Lookup — OUI Vendor Identifier

Look up the manufacturer and vendor information for any MAC address using the OUI database.

MAC Address

Accepts any format: colons, dashes, dots, or plain hex

MAC Address Lookup — OUI Vendor Identifier

A MAC address (Media Access Control address) is a unique hardware identifier assigned to a network interface card (NIC). It is used at the data link layer of the OSI model to identify devices on a local network.

MAC Address Structure

A MAC address consists of 6 bytes (48 bits) expressed as 12 hexadecimal digits:

First 3 bytes (OUI): Assigned by IEEE to manufacturers. Identifies the vendor.
Last 3 bytes: Assigned by the manufacturer to uniquely identify the device.

Common MAC Address Formats

00:1A:2B:3C:4D:5E — colon-separated (most common)
00-1A-2B-3C-4D-5E — dash-separated (Windows style)
001A.2B3C.4D5E — dot-separated (Cisco style)
001A2B3C4D5E — plain hex