Identify the manufacturer of any network device from its MAC address using the IEEE OUI (Organizationally Unique Identifier) database. Enter a full MAC address or just the first 3 octets in any format — colon-separated, hyphen-separated, Cisco dot notation, or plain hex. Results are cached locally for fast repeat lookups. Useful for network inventory, identifying rogue devices, security auditing, and troubleshooting unknown hardware on your LAN.
ip link (Linux), ipconfig /all (Windows), or ifconfig (macOS) to find your MAC address.
The first 3 octets (OUI) identify the manufacturer.
AA:BB:CC:DD:EE:FF - Colon separatedAA-BB-CC-DD-EE-FF - Hyphen separatedAABB.CCDD.EEFF - Cisco formatAABBCCDDEEFF - No separatorsFF:FF:FF:FF:FF:FF - Broadcast01:00:5E:xx:xx:xx - IPv4 Multicast33:33:xx:xx:xx:xx - IPv6 Multicastx2:xx:xx:xx:xx:xx - Locally administered00:50:56 - VMware ESXi00:0C:29 - VMware VM00:15:5D - Microsoft Hyper-V52:54:00 - QEMU/KVM08:00:27 - VirtualBoxA MAC (Media Access Control) address is a unique 48-bit hardware identifier assigned to every network interface. It is typically written as six pairs of hexadecimal digits (e.g., AA:BB:CC:DD:EE:FF). MAC addresses operate at Layer 2 of the OSI model and are used for communication within a local network segment, as opposed to IP addresses which handle routing between networks.
An OUI (Organizationally Unique Identifier) is the first three octets (24 bits) of a MAC address, assigned by the IEEE to hardware manufacturers. For example, MAC addresses starting with 00:1A:2B belong to a specific manufacturer. Looking up the OUI lets you identify the vendor — useful for network inventory, security auditing, and identifying unknown devices on your network.
This tool accepts all common MAC address formats: colon-separated (AA:BB:CC:DD:EE:FF), hyphen-separated (AA-BB-CC-DD-EE-FF), dot-separated Cisco notation (AABB.CCDD.EEFF), and plain (AABBCCDDEEFF). You can enter a full 48-bit MAC address or just the first 3 octets (the OUI portion) to identify the manufacturer.