DB updated daily · 30757 vendors
MAC Address Lookup
Instantly identify the manufacturer behind any MAC address or OUI prefix. Free, fast, and always up to date.
Network tools
Seven free tools. No sign-up, no limits.
MAC Lookup
Identify the vendor behind any MAC address or OUI prefix.
IP Calculator
Subnet masks, CIDR ranges and host counts in one place.
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WHOIS / DNS
Domain registration data and full DNS record sets.
Traceroute
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Port Check
Test whether a TCP port is open and reachable.
Blacklist CheckerNEW
Check an IP against 40+ spam and abuse blacklists.
What is a MAC address?
A MAC (Media Access Control) address is a 48-bit hardware identifier assigned to every network interface — Wi-Fi cards, Ethernet ports, Bluetooth radios. It is usually written as six pairs of hex digits, like 00:1A:2B:3C:4D:5E.
The first half of the address is the OUI (Organizationally Unique Identifier), a prefix that the IEEE assigns to manufacturers. Looking up the OUI tells you who made the device — that is exactly what this tool does.
Frequently asked questions
How do I find my MAC address?▾
Windows: run "ipconfig /all" and look for Physical Address. macOS: System Settings → Network → Details. Linux: run "ip link". iOS/Android: Settings → About → Wi-Fi address.
What is an OUI?▾
The Organizationally Unique Identifier is the first 24 bits of a MAC address. The IEEE Registration Authority assigns each OUI to one manufacturer, which makes vendor lookups possible.
What do MA-L, MA-M and MA-S mean?▾
They are IEEE block sizes: MA-L (large) gives a vendor 2²⁴ addresses under a 24-bit prefix, MA-M (medium) 2²⁰ under a 28-bit prefix, and MA-S (small) 2¹² under a 36-bit prefix.
Why is my MAC address not found?▾
Modern phones and laptops use randomized "private" Wi-Fi addresses that are not registered to any vendor. Locally administered addresses (second hex digit 2, 6, A or E) are also not in the registry.
Is this service really free?▾
Yes. Every tool on macdetect.com is completely free, with no sign-up and no limits for normal use. An optional API key raises the automated request limit for developers.
Where does the vendor data come from?▾
Directly from the IEEE Registration Authority, which assigns MAC address blocks (MA-L, MA-M and MA-S) to manufacturers. The database is refreshed regularly so lookups stay current.
Can I use the lookup in my own application?▾
Yes. We offer a free REST API — see the API documentation. Anonymous requests are rate limited per IP; register an API key for a higher limit.
What network tools do you offer?▾
MAC address lookup, an IPv4/IPv6 subnet calculator, IP geolocation, WHOIS and DNS lookup, traceroute, a TCP port checker and an IP blacklist (RBL/DNSBL) checker — all free.