MAC Address Vendor Lookup
Free MAC address vendor lookup.
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What is MAC Address Vendor Lookup?
A MAC address vendor lookup identifies the manufacturer of a network interface from its 48-bit hardware address. The first 24 bits (the OUI) are registered with the IEEE, and this tool matches them against a bundled dataset of 40,000+ vendors entirely in your browser.
Key Benefits
- Identify unknown devices on your home or office network in seconds
- Fully offline: the IEEE OUI dataset ships with the page, nothing is uploaded
- Detect randomized privacy MAC addresses used by modern phones
- Convert between colon, hyphen, Cisco dotted, and bare hex notations
- Derive the EUI-64 interface ID and IPv6 link-local address for network debugging
Common Use Cases
- •Spot an unfamiliar device in your router client list before investigating further
- •Check whether a device is genuinely made by the brand its seller claims
- •Network troubleshooting: map MAC addresses to vendors in switch and AP logs
- •IPv6 SLAAC debugging: compute the EUI-64 identifier behind a link-local address
How to Look Up a MAC Address Vendor
- Find the MAC address: Get the MAC address of the device you want to identify - from your router client list, phone Wi-Fi settings, or an arp/ipconfig/ip command output.
- Paste it into the input: Enter the address in any common notation: 3C:D9:2B:12:34:56, 3C-D9-2B-12-34-56, 3CD9.2B12.3456, or 3CD92B123456 - the parser normalizes all of them.
- Run the lookup: Press the Look up button. The tool matches the first 3 bytes (the OUI) against a bundled IEEE dataset and shows the vendor, address type, and all notations.
- Copy what you need: Use the copy button next to any format, the OUI prefix, the EUI-64 interface identifier, or the derived IPv6 link-local address.
Key Features
- Offline IEEE OUI dataset with 40,000+ registered vendors bundled in the browser
- Accepts colon, hyphen, Cisco dotted, and bare hex notations
- Unicast/multicast and universal/local (U/L) bit detection with plain-English labels
- Randomized MAC detection for privacy-aware phone addresses
- EUI-64 interface identifier and IPv6 link-local address derivation (RFC 4291)
- One-click copy for every notation, the OUI prefix, and derived values
Frequently Asked Questions
What is a MAC address and what can it tell me?
A MAC (Media Access Control) address is the 48-bit hardware identifier of a network interface. Its first 24 bits are an OUI assigned by the IEEE to a manufacturer, so a lookup reveals who made the network card - useful for identifying unknown devices on your router.
Does this tool send my MAC address to a server?
No. The full IEEE OUI dataset (40,000+ vendors) is bundled with the page and the lookup runs entirely in your browser. The address never leaves your device.
Why does my phone show an unknown vendor or a locally administered address?
Modern phones and operating systems use randomized (locally administered) MAC addresses per Wi-Fi network for privacy. Those addresses have the U/L bit set and carry no vendor information - the tool flags them explicitly.
Which MAC address formats are supported?
All common notations: colon-separated (3C:D9:2B:12:34:56), hyphen-separated (3C-D9-2B-12-34-56), Cisco dotted (3CD9.2B12.3456), and bare hex (3CD92B123456). The tool converts between all of them.