The Original Format - Addresses are assigned to manufacturers by the IEEE standards committee, and are built into the device at build time, similar to Ethernet MAC address. First 2 bytes are either hexadecimal 10:00 or 2x:xx (where the x's are vendor-specified) followed by the 3-byte vendor identifier and 3 bytes for a vendor-specified serial number.
Example:
Bytes 2,3,4 contain the OUI for WWN beginning with 10:00 or 2x:xx (21:00:00:1B:32:12:c0:59) OUI = 00-1B-32)
The New Format: First half-byte is either hexadecimal 5 or 6 followed by a 3-byte vendor identifier and 4 bytes and a half for a vendor-specified serial number.
Example:
Bytes 0 lower nibble, byte 1,2 byte 3 upper nibble. OUI for WWN beginning with 50: or60: (50:01:43:80:02:24:25:34) OUI = 00-14-38
Some of the QLogic® OUIs are: