In Fibre Channel SAN, a World Wide Name (WWN) uniquely identifies each element in the network, such as a Fibre Channel adapter or storage device.

The WWN is a 64-bit address that consists of 16 hexadecimal numbers and might look like this:

20:00:00:e0:8b:8b:38:77 21:00:00:e0:8b:8b:38:77

The WWN is assigned to every Fibre Channel SAN element by its manufacturer.