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.
Question not answered here? Contact us.