MAC Address Vendor Lookup

A MAC address (Media Access Control address) is a unique hardware identifier assigned to every network interface on a device. Whether it is a laptop’s Wi-Fi adapter, a server’s Ethernet port, or a smart thermostat’s wireless radio, each one carries a 48-bit MAC address burned into it at the factory. These addresses are typically written as six pairs of hexadecimal digits separated by colons or dashes — for example, 00:1A:2B:3C:4D:5E. Unlike IP addresses, which can change depending on your network, a MAC address is tied to the physical hardware itself. MAC addresses operate at Layer 2 of the OSI model, which means they are used for communication within a local network segment rather than across the internet.

What Is an OUI?

The first three octets (six hex characters) of a MAC address form the Organizationally Unique Identifier, or OUI. The IEEE assigns OUI prefixes to manufacturers and vendors, which means the first half of any MAC address tells you who made the device. When you perform a MAC address lookup using the tool above, it queries the OUI portion against a vendor database to find the manufacturer. This is sometimes called an OUI lookup or a MAC address vendor search. For example, a MAC address starting with 00:1A:2B might resolve to a specific networking company, immediately telling you the brand of hardware you are dealing with.

Why Look Up a MAC Address Vendor?

There are several practical scenarios where the ability to find a MAC address vendor proves valuable:

• Network troubleshooting: When reviewing ARP tables, DHCP leases, or switch port mappings, identifying which vendor made a device helps you quickly distinguish between routers, printers, IoT sensors, and workstations on a busy network. See our network troubleshooting guide for more techniques.
• Device identification: If you see an unfamiliar MAC address on your home or office network, looking up the vendor can help you figure out what kind of device it belongs to — whether it is an expected smart home gadget or an unauthorized intruder.
• Security auditing: Network administrators performing security audits use MAC vendor lookups to inventory hardware on the network. Spotting an unexpected manufacturer in DHCP logs can flag rogue devices or policy violations before they become a larger security concern.
• Asset management: In enterprise environments with hundreds or thousands of connected devices, correlating MAC addresses to vendors streamlines hardware inventory and helps track device lifecycles.

This tool uses the macvendors.com API to resolve the OUI portion of the MAC address you provide. Simply paste or type a full or partial MAC address into the field above, and the lookup returns the registered vendor name in real time — no software installation required.

Related Tools & Resources

Explore more of our free networking tools: use the What Is My IP Address tool to check your public IP, run a DNS Lookup to inspect domain records, or review common network ports when configuring firewall rules.