Look Up MAC Address Manufacturer — 38,000+ IEEE Records
A free MAC address tool with a built-in database of 38,000+ IEEE OUI entries covering virtually every network device manufacturer. Look up any vendor by MAC address, generate random addresses for testing and development, and convert between Linux, Windows, Cisco, and raw formats. Instant results, no signup required.
How to Look Up a MAC Address
Type or paste a MAC address in any format — colons, dashes, dots, or raw hex are all accepted automatically.
The manufacturer is identified instantly from the built-in IEEE OUI database. No network request needed.
See whether the address is unicast or multicast, and whether it is universally or locally administered.
Paste multiple MAC addresses to look up all vendors at once. Export results as CSV for documentation.
Identify device manufacturers, generate test MACs, and convert between all standard formats
Features
Frequently Asked Questions
What is a MAC address?
A MAC (Media Access Control) address is a unique 48-bit hardware identifier assigned to every network interface. The first 3 bytes (24 bits) form the OUI that identifies the manufacturer, while the last 3 bytes are device-specific.
What is an OUI?
OUI (Organizationally Unique Identifier) is a 24-bit number assigned by the IEEE to hardware manufacturers. It forms the first half of a MAC address and identifies who made the network device.
What MAC address formats are supported?
All common formats: colon-separated (AA:BB:CC:DD:EE:FF), dash-separated (AA-BB-CC-DD-EE-FF), Cisco dot notation (AABB.CCDD.EEFF), and raw hex (AABBCCDDEEFF). The tool auto-detects the format.
What is the difference between unicast and multicast MAC addresses?
Bit 0 of the first byte determines the type. If 0, the address is unicast (targets a single device). If 1, it is multicast (targets a group). The broadcast address FF:FF:FF:FF:FF:FF is a special multicast address that reaches all devices.
What does "locally administered" mean?
Bit 1 of the first byte indicates administration scope. Universal (UAA) addresses are assigned by the manufacturer. Local (LAA) addresses are set by software or a network administrator, overriding the hardware address.
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