MAC Address Lookup: Find the manufacturer of a MAC address
MAC Address Lookup helps you find the manufacturer of a MAC address. The tool checks the OUI prefix against the IEEE MA-L, MA-M, MA-S and IAB registries and shows the manufacturer, country, OUI block and address type. It detects randomly generated (locally administered) addresses from the U/L bit. You can also search by manufacturer to see how many OUI blocks a company has registered, along with example prefixes.
Built by Rugile Rutkauskaite
Free and no sign-up required: The lookup runs on our servers, and your input is not shared with third parties.
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Example result
What the MAC Address Lookup shows you
You enter a MAC address, and the tool looks up the matching OUI block in the IEEE registries and shows the manufacturer, block, country, and address type. For a randomly generated address, it tells you why there's no manufacturer. Both addresses below are fictional examples, not real devices.
Example · Two fictional sample addresses
Input: manufacturer address
- MAC address
- 3C:22:FB:00:00:01
- The first three bytes are the manufacturer’s OUI prefix.
Output
- Manufacturer
- Apple, Inc.
- Country
- United States
- From the manufacturer's registration address at the IEEE.
- OUI prefix
- 3C:22:FB
- MA-L (24-bit block, 16,777,216 (~16.8 M) Addresses)
- OUI range
- 3C:22:FB:00:00:00 – 3C:22:FB:FF:FF:FF
- Address type
- Globally assigned/IEEE-assigned (U/L bit) · Unicast (I/G bit)
Input: randomly generated address
- MAC address
- DA:A1:19:12:34:56
- The U/L bit is set in the first byte: the device assigned itself the address.
Output
- Manufacturer
- No entry (randomized)
- Modern operating systems randomize Wi-Fi MAC addresses for privacy. Such addresses generally have no IEEE entry.
- Address type
- Locally administered (U/L bit) · Unicast (I/G bit)
How it works
Look up a MAC address: How to find the manufacturer
From MAC address to manufacturer in five steps, with no account or installation required.
Step 1
Select mode
Select “Search by MAC” above the search field to find the manufacturer, or “Search by manufacturer” to see a company's OUI blocks.
Step 2
Enter MAC address
Enter the MAC address or just the OUI, such as 3C:5A:B4:12:34:56, 3C-5A-B4, 3C5A.B412.3456 or 3C5AB4. In manufacturer mode, enter a name such as “Cisco”.
Step 3
Start search
Click the button next to the input field. The tool checks the prefix against the IEEE registries.
Step 4
Read result
You see the manufacturer and country, the OUI prefix and block size in bits, and the address type (locally administered or global, unicast or multicast). “Show details” lists the registration type, IEEE address, OUI range and number of addresses in the block.
Step 5
Copy or share
Copy the normalized address with one click or share the page URL: it includes your query as ?mac= or ?vendor=.
Basics
What is a MAC address, and how is it structured?
The tool uses the structure of the MAC address to determine its manufacturer and address type.
48 bits in 6 bytes
A MAC address identifies a network interface, such as Wi-Fi, Ethernet or Bluetooth. It consists of 48 bits and is written as 6 hexadecimal pairs, e.g. 3C:5A:B4:12:34:56.
OUI: the manufacturer portion
The IEEE assigns the first part to a manufacturer: 24 bits (MA-L), 28 bits (MA-M) or 36 bits (MA-S and the older IAB). The manufacturer assigns the rest. The tool checks the longest matching prefix first.
I/G bit: unicast or multicast
The least significant bit of the first byte. 0 means unicast (a single network interface), while 1 means multicast or broadcast (a group address such as FF:FF:FF:FF:FF:FF). For multicast addresses such as 01:00:5E, the tool also looks up the unicast OUI 00:00:5E and marks the match as derived from the multicast convention.
U/L bit: globally or locally administered
The second least significant bit of the first byte. 0 means assigned by the IEEE; 1 means locally administered, such as a randomized Wi-Fi address on your smartphone. The tool shows both bits under “Address type” in the results.
Context
Identify a device by its MAC address: what you can and can't find out
A MAC address identifies the manufacturer of the network interface, not the device itself. An Apple prefix, for example, could belong to an iPhone, iPad or MacBook.
What the tool shows you
- the manufacturer that registered the OUI block with the IEEE
- the country in the manufacturer's registration address
- the OUI prefix with block size, registration type and address range
- whether the address is locally administered (randomized) or globally assigned
- whether it is a unicast or multicast address
What a MAC address cannot tell you
- the exact device model
- the device's owner or name
- the device's location
- the device's IP address
Unknown device on your Wi-Fi?
Open your router's device list, copy the MAC address of the unknown entry and enter it above. The manufacturer can help you narrow down which device it might be. If the tool shows “No match (randomized),” the device is using a randomized Wi-Fi address, as many smartphones do.
Why this tool
Benefits at a glance
What sets this MAC Address Lookup apart from a quick Google search.
Directly from the IEEE source
The lookup uses a snapshot of the official IEEE registries, not a third-party database.
No sharing with third parties
The lookup runs on our servers without contacting an external service. Your input is not sent to any third party.
Both directions possible
Find the manufacturer of a MAC address or search by manufacturer name to see its OUI blocks with example prefixes.
Detects special cases
Automatically detects randomly generated (locally administered) addresses and matches derived from multicast conventions.
Four IEEE registries
Covers MA-L (24-bit), MA-M (28-bit), MA-S, and the older IAB (both 36-bit) equally.
Share result
Your query appears in the URL as ?mac= or ?vendor=, so you can share the result with a link. You can copy the normalized address with one click.
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FAQ
Frequently asked questions about MAC Address Lookup
Brief answers about MAC addresses, OUI blocks, and manufacturer identification.
Enter the full MAC address or just the first 3 bytes (the OUI) above. The tool searches the IEEE registries for the longest matching prefix first (36, then 28, then 24 bits) and shows the manufacturer, country, OUI prefix and address type. For example, for 3C:22:FB:00:00:01 it finds Apple, Inc. (country: United States) with OUI prefix 3C:22:FB and registry type MA-L (24-bit block, 16,777,216 (~16.8 M) Addresses).
Only the manufacturer. A MAC address tells you which company registered the OUI block with the IEEE, usually the maker of the network chip or device. It does not contain the model, owner or location. The country shown comes from the manufacturer's registration address, not the device's location. To identify an unknown device on your Wi-Fi network, check your router's device list.
Usually, the address is randomly generated and therefore locally administered: Many smartphones and laptops use a private, random MAC address on Wi-Fi, which also appears as the Wi-Fi address in their settings. There is no IEEE entry for it. The tool detects these addresses from the U/L bit and shows “No entry (randomized)”. Less commonly, the block is absent from the public IEEE registries; in that case, it shows “No entry found”.
Colons (3C:5A:B4:12:34:56), hyphens (3C-5A-B4-12-34-56), Cisco dot notation (3C5A.B412.3456), dots between individual bytes, or no separators (3C5AB4123456). Exactly 1, 3 or 6 bytes are allowed, so you can enter just the OUI. When separators are used, the tool adds missing leading zeros. It rejects mixed separators such as 3C:5A-B4.
Windows: Enter “ipconfig /all” in Command Prompt. The “Physical Address” field is your MAC address. macOS: System Settings → Wi-Fi or Ethernet → Details, or “ifconfig en0” in Terminal. Linux: “ip link show”. Android: Settings → About phone → Status → Wi-Fi MAC address. iOS: Settings → General → About → Wi-Fi Address. Enter the address you find into the tool above to check the manufacturer.
A MAC address is the hardware identifier of a network interface and is used on the local network (layer 2). An IP address is a logical address on a network or the internet (layer 3) and can change. The “arp -a” command shows which MAC address belongs to an IP on your own network. This tool does not convert IP addresses; it identifies the manufacturer of a MAC address.
Yes. Switch to “Search by manufacturer” above and enter at least 2 characters, such as “Apple” or “Cisco”. The tool shows up to 20 matching manufacturers, each with its number of registered OUI blocks and up to 8 example prefixes. If there are more matches, narrow your search.
No. The lookup runs on our servers against a local snapshot of the public IEEE registries. No external service is contacted for the search, so your input is not shared with third parties. You do not need to sign up.
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