Question 1

What is an OUI (Organizationally Unique Identifier)?

Accepted Answer

An OUI is the first 24 bits (3 octets) of a standard MAC address assigned by the IEEE Registration Authority to identify the manufacturer of a network interface card (NIC).

Question 2

Can this tool identify a randomized private MAC address?

Accepted Answer

Yes. By evaluating the U/L (Universal/Local) bit in the first octet, the tool automatically detects whether an address is a globally registered hardware address or a privacy-randomized address generated by iOS, Android, or Windows.

Question 3

What is the difference between EUI-48 and EUI-64?

Accepted Answer

EUI-48 uses 48 bits (6 octets) and is standard for Ethernet and Wi-Fi devices. EUI-64 uses 64 bits (8 octets) and is primarily utilized in IPv6 SLAAC address autoconfiguration and Zigbee networks.

Question 4

Does this lookup require a backend server or API key?

Accepted Answer

No. The tool runs 100% in your browser using an embedded IEEE registry cache and open-access CORS mirrors with zero tracking.

MAC Address Lookup & OUI Inspector

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