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IP & network

MAC address vendor lookup

Find a device vendor by MAC address in the current IEEE registry (MA-L, MA-M, MA-S). Paste many addresses at once, such as an ARP or DHCP table, in any format.

Up to 500 addresses at once. The database loads in parts; addresses are not sent anywhere.

How a MAC address works

The first 24 bits (OUI) are a number IEEE assigns to the manufacturer. Big vendors get MA-L blocks, smaller ones MA-M (28 bits) and MA-S (36 bits), so we look for the longest matching block. The rest is assigned by the vendor.

Why no vendor was found

  • The address is locally administered (second digit 2, 6, A or E): phones and laptops use a random MAC per Wi-Fi network, and VMs get such addresses too.
  • It is a reserved group address: VRRP, HSRP, STP, IPv4/IPv6 multicast.
  • The block is unregistered or the vendor chose a private listing.

Where to get a list of addresses

Linux: ip neigh, Windows: arp -a, MikroTik: /ip arp print or /ip dhcp-server lease print, Cisco: show mac address-table. Paste the whole output; addresses are found automatically.

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