Enter a MAC address in any common format to validate it, see it in all four standard formats, and read what its structure bits say.
The analyzer normalises colon, hyphen, dotted and bare-hex input into the underlying six octets, then reports the structure that is encoded in the address itself: the first three octets (the OUI prefix, shown as a prefix only), the multicast bit and the locally administered bit in the first octet, and whether the address is the broadcast address or all zeros. It does NOT look up vendor or manufacturer names — there is no vendor database behind this page, so no company name can be given for an OUI. Any tool that names a manufacturer is consulting a separate registry list, which this analyzer deliberately does not include.
Can this tool tell which company made the network card? No. It does not look up vendor or manufacturer names and has no database to do so. It shows the OUI prefix (the first three octets) and analyses the address structure only; naming a maker requires a separate registry lookup.
What is the difference between the multicast and locally administered bits? Both live in the first octet. The least significant bit is the multicast bit: set means a group address rather than a single device. The next bit is the locally administered bit: set means the address was assigned locally (for example by virtualisation software) rather than burned in by a manufacturer.
Which input formats are accepted? Colon form (00:1B:44:11:3A:B7), hyphen form (00-1B-44-11-3A-B7), dotted form (001B.4411.3AB7) and bare hex (001B44113AB7), in upper or lower case.