MAC Address Lookup

The tool names the manufacturer of a network card from its MAC address: the company, country and registry address, and the size of the block assigned to it. The first three bytes of the address are bought from IEEE, so they show who released the device. The database comes from the IEEE registries; its update date appears under the result.

Why some addresses have no manufacturer

If the second bit of the first byte is set, the address was assigned on the spot rather than at the factory. Random addresses that phones use when joining Wi-Fi look like this, as do virtual machine addresses. Such an address has no manufacturer, and the tool says so directly instead of guessing at a random match.

A list from your router and company search

Paste your router's client table or the full output of arp into the list field: addresses are picked out of the text automatically, duplicates merge, and the result exports to CSV. Type a company name like Xiaomi, and the tool shows all of its blocks, which makes it easier to spot devices of the same brand in a list.