MAC address lookup
Find which company made a network card from its MAC address, using the IEEE registry. Paste one MAC or a whole list.
Vendor
00:1b:63:84:45:e6Example: type your own MAC address above.
MAC address
every notation, and what its bits say
- Colons (Linux, macOS)
- 00:1b:63:84:45:e6
- Colons, upper case
- 00:1B:63:84:45:E6
- Hyphens (Windows, IEEE)
- 00-1B-63-84-45-E6
- Dotted (Cisco)
- 001b.6384.45e6
- Plain hex
- 001b638445e6
- Type
- EUI-48 (6 bytes, the usual MAC)
- I/G bit
- 0: unicast (one device)
- U/L bit
- 0: universally administered (set by the maker)
- OUI (maker prefix)
- 00:1b:63
How it works
Every network card leaves the factory with a MAC address, a 48-bit number like 00:1b:63:84:45:e6. The first half is the maker's prefix, which it buys from the IEEE Registration Authority. This page looks that prefix up in the IEEE's public lists. Big makers buy 24-bit blocks (MA-L, the classic “OUI”); smaller ones buy 28-bit (MA-M) or 36-bit (MA-S) blocks, so the page always picks the longest match.
The lookup runs in your browser. It downloads only the small slice of the list your MAC needs, and nothing you type leaves your computer.
Some MACs have no maker. If the second hex digit is 2, 6, A or E, the address is locally administered: software chose it. Phones and laptops now use random MACs on Wi-Fi for privacy, and virtual machines get made-up ones too. To turn a MAC into an IPv6 address, use MAC to IPv6 (EUI-64). For IP addresses, try IP to ASN to see which network owns one.