MAC Address Lookup

Find who made any MAC address, spot private (random) addresses and check a whole device list at once.

Runs in your browser. Nothing you enter is uploaded.

· · IEEE list of 54,219 prefixes, October 17, 2026

Enter a MAC address to find its maker

Paste one address, or a whole list such as your router’s device list or the output of arp -a.

How to use MAC Address Lookup

  1. Type or paste a MAC address in any format: 3C:22:FB:12:34:56, 3C-22-FB-12-34-56 or 3c22.fb12.3456.
  2. Or paste a whole list, such as your router’s device list or the output of arp -a. Each address is looked up once.
  3. Read the result: the company that registered the address, or why it has none, such as a private (random) address.
  4. Copy the results. A list copies as columns that paste straight into a spreadsheet.

How it works

The first half of a MAC address is a prefix the IEEE assigned to one company. The tool looks it up in the IEEE’s public list of registered prefixes, the same list network scanners use, and shows the company, its country and the size of its block. The list’s date is shown under the box.

The addresses you enter stay in your browser. The page downloads only the part of the list it needs, picked by the first two digits.

It reads every common way of writing an address:

Format Example Where you see it
Colons 3C:22:FB:12:34:56 Routers, Linux, macOS
Hyphens 3C-22-FB-12-34-56 Windows (ipconfig, arp -a, getmac)
Dots 3c22.fb12.3456 Cisco switches and routers
No separators 3C22FB123456 Spreadsheets, some router lists

Paste a whole list, such as a router’s device list or the output of arp -a, and each address is looked up once, with the IP address from the same line. Six digits or more, like 3C:22:FB, look up just the prefix.

Reading the result

Result What it means
A company name The company that registered the prefix. It made the network chip, which is often the device’s own brand. Parts makers like Espressif, Murata or Intel put chips in other brands’ devices.
Private (random) address The device made the address up itself, so no company is registered for it. See below.
Not listed Nobody has registered the prefix, it was registered after the list’s date, or there’s a typo.
Maker kept private The company asked the IEEE not to publish its name.
Shared by several companies The IEEE splits this prefix into smaller blocks. Enter more digits, or the whole address.
Broadcast, multicast Traffic for every device or a group of devices. These aren’t devices.
VMware, VirtualBox, Hyper-V, QEMU/KVM, Docker A virtual machine or container, named from the prefix its software uses.

Private (random) addresses

Phones, tablets and laptops make up a new address for each Wi-Fi network, so networks can’t follow them from place to place. You can spot one by its second digit: 2, 6, A or E (like DA:A1:19:…). The device is real; only its maker is hidden.

To find out which of your devices it is, open the Wi-Fi settings on each one and compare the address shown for your network:

  • iPhone and iPad: Settings → Wi-Fi → the ⓘ next to your network. Private Wi-Fi Address is the switch.
  • Android: Wi-Fi → your network → MAC address (often under Privacy). Randomized MAC is the setting.
  • Windows: Settings → Network & internet → Wi-Fi → Hardware properties. Random hardware addresses is the switch.
  • Mac: System Settings → Wi-Fi → Details next to your network.

Turning the private address off for your home network gives the device the same address every time, which makes router lists and parental controls easier to manage.

Find an unknown device on your Wi-Fi

  1. Open your router’s device list. Its address is usually on the router’s label, often 192.168.0.1 or 192.168.1.1. On a Windows computer, arp -a in Command Prompt lists the devices it has talked to recently.
  2. Copy the list and paste it here.
  3. Match each maker to a device you own: Apple to your iPhone, Espressif to a smart plug, Amazon to an Echo or Fire TV.
  4. For private addresses, compare them with your own devices as shown above.
  5. If a device is still unaccounted for, change your Wi-Fi password. Every device has to reconnect with the new one, so a stranger is locked out.

Find a device’s MAC address

Device Where to look
Windows Run ipconfig /all and look for Physical Address, or run getmac.
Mac System Settings → Wi-Fi → Details next to your network.
iPhone, iPad Settings → General → About → Wi-Fi Address.
Android Settings → About phone. The wording varies by phone.
Linux Run ip link and look after link/ether.
Every device on your network Your router’s device list, or arp -a on a computer on the same network.

The address in About on a phone is its real one. On Wi-Fi it may use a private address instead, and that’s the one your router shows.

Questions

How do I find out what device a MAC address belongs to?

Look it up here to see which company made the device's network chip, which is often the device's own brand (Apple, Amazon, Raspberry Pi). Then find the address in your router's device list, which shows each device's name and IP address. If the result says private, the device made up the address, so compare it with the Wi-Fi address in the settings of your own phones and laptops.

What is an OUI in a MAC address?

The OUI (Organizationally Unique Identifier) is the first 6 hex digits of a MAC address, like 3C:22:FB. The IEEE assigns it to a company, which uses the remaining digits for its devices. Smaller blocks use 7 digits (MA-M) or 9 digits (MA-S), so the lookup matches the longest prefix first.

Can a MAC address identify a person?

No. It shows which company made the network chip, not who owns the device or where it is. Devices only share it with the local network they're connected to, so websites never see it.

Why does my phone have a different MAC address on each Wi-Fi network?

Phones, tablets and laptops use a private (random) address for each Wi-Fi network, so networks can't follow them from place to place. You can spot one: its second digit is 2, 6, A or E. To use the real address on your home network, turn off Private Wi-Fi Address (iPhone, iPad, Mac) or randomized MAC (Android) in that network's settings.

Why does a MAC address lookup say vendor not found?

Usually the address is private (random), so it has no maker. Otherwise the company never registered the prefix, registered it after the list was updated, or the address has a typo. Broadcast (FF:FF:FF:FF:FF:FF) and multicast addresses belong to no device, and the result says so.

How do I find the MAC address of a device?

On Windows, run ipconfig /all and look for Physical Address. On an iPhone or iPad, open Settings → General → About → Wi-Fi Address. On Android, look under Settings → About phone. For every device at once, open your router's device list, or run arp -a on a computer on the same network.

Updated October 19, 2026 · Works in current Chrome, Edge, Firefox and Safari · Runs entirely in your browser