MAC Address Lookup

Find the vendor, OUI manufacturer, address type, and local/vendor administration flags for any MAC address.

Supports: 00:1A:2B:3C:4D:5E · 00-1A-2B-3C-4D-5E · 001A.2B3C.4D5E · 001A2B3C4D5E

How MAC Address Lookup Works

Every network interface — Wi-Fi adapters, Ethernet cards, Bluetooth modules — has a unique 48-bit identifier called a MAC address (Media Access Control). The first 24 bits form the OUI (Organizationally Unique Identifier), which is assigned by the IEEE to hardware manufacturers.

By looking up the OUI portion of a MAC address, you can identify which company manufactured the network interface. This is useful for network administration, device inventory, security auditing, and troubleshooting unknown devices on your network.

Our database contains 38,000+ OUI entries from the IEEE registry data bundled with this tool, covering many network hardware manufacturers — from Apple and Intel to specialized industrial IoT vendors.

If you need new test data instead of identifying existing hardware, use the random MAC address generator to create fake, dummy, local, or vendor MAC addresses. For deeper background, read the MAC address guide or the OUI manufacturer guide.

Common Use Cases

  • Identify unknown devices on your network
  • Network inventory and asset management
  • Security auditing and intrusion detection
  • Troubleshooting connectivity issues
  • Verify hardware manufacturer claims

Address Anatomy

  • Octets 1–3: OUI (manufacturer identifier)
  • Octets 4–6: NIC-specific (device unique)
  • Bit 0 of Octet 1: Unicast (0) / Multicast (1)
  • Bit 1 of Octet 1: UAA (0) / LAA (1)

Frequently Asked Questions

What is a MAC address lookup?
A MAC address lookup identifies the manufacturer (vendor) of a network device by analyzing the first three octets of its MAC address, known as the OUI (Organizationally Unique Identifier). The IEEE maintains the official registry of OUI assignments.
What is an OUI (Organizationally Unique Identifier)?
An OUI is the first 24 bits (3 bytes) of a MAC address, assigned by the IEEE to hardware manufacturers. For example, 00:03:93 belongs to Apple. The OUI tells you which company manufactured the network interface.
What does unicast vs multicast mean?
The least significant bit of the first octet determines the type. If it's 0, the address is unicast (destined for a single device). If it's 1, it's multicast (destined for a group of devices). Real network interfaces almost always use unicast addresses.
What does UAA vs LAA mean?
UAA (Universally Administered Address) means the MAC was assigned by the manufacturer using their IEEE-registered OUI. LAA (Locally Administered Address) means the MAC was manually set or randomized by software. The second bit of the first octet indicates this: 0 = UAA, 1 = LAA.
How accurate is this MAC address lookup?
Our database contains over 38,000 OUI entries from IEEE registry data bundled with this tool. For UAA (universally administered) addresses, the vendor lookup is usually accurate when the prefix exists in the bundled data. For LAA (locally administered) addresses — common with VPNs, VMs, and privacy features — there is no vendor to look up.
Why does a lookup show "Locally Administered Address"?
A locally administered MAC address was set by software instead of assigned by a hardware vendor. It is common with randomized Wi-Fi addresses, virtual machines, containers, VPN adapters, and generated test data. If you need one for development, use the random MAC address generator and choose Local administration.
Can I look up any MAC address?
Yes. Enter any valid MAC address in any common format (colon-separated, hyphen-separated, Cisco dot notation, or plain hex). The tool will parse it, identify the vendor, and show you a full breakdown including binary representation.
Where do I find my device's MAC address?
On Windows, run ipconfig /all in Command Prompt. On macOS/Linux, run ifconfig or ip link in Terminal. On smartphones, check Settings → About → Wi-Fi MAC Address. Routers typically show connected device MACs in their admin panel.
Is my MAC address sent to your server?
No. This tool runs 100% in your browser. The OUI database is downloaded once and cached locally. Your MAC address never leaves your device — we can't see it, log it, or store it.

Related Tools and Guides

MAC Address Generator

Generate random MAC addresses with custom format, vendor prefix, and bulk export options.

OUI Manufacturer Guide

Learn how vendor prefixes identify hardware manufacturers and why some addresses have no vendor.

Find Your MAC Address

Get the MAC address from Windows, macOS, Linux, iPhone, Android, routers, and network tools.

Quick Reference

MAC Format

XX:XX:XX:YY:YY:YY

XX = OUI (vendor) · YY = NIC-specific

First Octet Flags

Bit 0 = 0: Unicast · 1: Multicast

Bit 1 = 0: UAA · 1: LAA

Total Address Space

248 = 281,474,976,710,656

Unique MAC addresses possible

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