MAC Address Lookup
The first three octets (first six hexadecimal characters) of a valid MAC address represent the MAC Address Block Large (MA-L), previously referred to as an OUI (Organizationally Unique Identifier).
Each MA-L is publically or privately registered to a company or other entity via the IEEE Registration Authority.
Use the search form below to look up the registrant for any publically registered MA-L.
MAC Address Search
Enter at least the first three octets (first six hexadecimal characters) of a MAC address in any format (any delimiters are ignored) or enter any part of a company name or address (e.g. Cisco or Atlanta):
MAC address format examples
The MAC Address Block Large (MA-L) / OUI (Organizationally Unique Identifier) component in each MAC address is highlighted.