MAC Address Lookup

Look up the manufacturer or vendor associated with a MAC address using the OUI prefix database.

MAC Address Lookup tool

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Example

Input: 00:E0:4C:68:00:1A

Result: Vendor Realtek Semiconductor, OUI Prefix 00:E0:4C, Address Type Unicast, Universally administered (OUI)

The first three bytes (00:E0:4C) are the OUI that IEEE assigned to the manufacturer; the tool looks them up in a bundled copy of the IEEE MA-L registry.

  1. Paste or type a MAC address in any common format (colon, hyphen, dot notation or plain hex).
  2. Enter the full 6-byte address, or just the first 3 bytes (the OUI prefix) for a quick vendor check.
  3. The tool searches its bundled IEEE OUI list as you type.
  4. Read the vendor name, the OUI prefix, the address type and the normalized full MAC address.
  5. If no vendor is found and the address is locally administered, the tool explains that it is likely randomized or virtual.

Find the Maker of a Device From Its MAC Address

The first three bytes of a MAC address, called the OUI, identify the company that made the network chip. Paste an address such as 00:E0:4C:68:00:1A and the lookup shows the registered vendor, here Realtek Semiconductor. It also shows the OUI and the address type.

The data is a bundled copy of the IEEE MA-L registry from March 2026, with about 39,000 prefixes. The search runs in your browser as you type, and nothing is sent to a server. Any common format works: colons, hyphens, Cisco dots or plain hex. You can also enter just the first six hex digits to check a prefix on its own.

This helps when an unknown device shows up in your router list, DHCP leases or ARP table. A vendor name, such as a printer or smart plug maker, often tells you what the device is. Keep in mind that it names the maker of the network chip, which is not always the brand on the box. It also says nothing about who owns the device.

Many lookups now come back empty, and that is normal. Phones, tablets and many laptops hide their real MAC on Wi-Fi by using a random, locally administered address for each network. The tool spots this from the second bit of the first byte and tells you. Some shared prefixes return IEEE Registration Authority instead of a company, because they are split into smaller blocks this list does not cover. To create test addresses, with or without a vendor prefix, use the MAC Address Generator.

Sources

Frequently Asked Questions

Look up the first six hex digits, the OUI, in the IEEE registry. Paste the whole address here and the tool does it for you: 00:50:56 returns VMware Inc. and 00:E0:4C returns Realtek Semiconductor. The result is the maker of the network chip, so a laptop may show its Wi-Fi chip vendor rather than the laptop brand.
Modern iPhones and Android phones use a private, randomized MAC for each Wi-Fi network by default, and Windows can do the same. These addresses have the locally administered bit set, so no vendor owns them, and the tool says so. The real hardware address is usually listed in the device settings, often under About or Wi-Fi details.
Some 24-bit prefixes are split into smaller blocks, called MA-M and MA-S, and shared by many small companies. The prefix itself is registered to the IEEE Registration Authority, and the final owner is set by the next few digits. This tool uses the 24-bit MA-L list only, so for those blocks it shows the IEEE entry instead of the company.
Yes. Most operating systems let you change the MAC address a network card uses, and many devices randomize it for privacy. A lookup tells you what the address claims, not what the hardware really is. Do not rely on MAC addresses alone for security decisions, such as letting a device onto a network.
No. A MAC address belongs to the network card and is only used on the local network segment. An IP address is assigned by the network and is used to route traffic between networks and across the internet. Your router links the two in its ARP table, which is a good place to find MAC addresses to look up.

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