World Wide Name (WWN)

A World Wide Name, or WWN, is a 64-bit address used in Fibre Channel networks to uniquely identify each element in a Fibre Channel network. It is similar to MAC address for the Network Interfaces. 

You can use "fcinfo hba-port" command in Solaris 10 to get information of WWN. 

Here you can see the HBA Port WWN (WWpN) and the Node WWN (WWnN) of the two ports on the installed Qlogic HAB card. This is also useful in finding the Model number, Firmwar version FCode, supported and current speeds and the port status of the HBA card/port.

Server1:/# fcinfo hba-port

HBA Port WWN: 210100e08bb467d8
        OS Device Name: /dev/cfg/c5
        Manufacturer: QLogic Corp.
        Model: 375-3363-xx
        Firmware Version: 03.03.28
        FCode/BIOS Version:  fcode: 1.13;
        Serial Number: not available
        Driver Name: qlc
        Driver Version: 20090519-2.31
        Type: N-port
        State: online
        Supported Speeds: 1Gb 2Gb
        Current Speed: 2Gb
        Node WWN: 200100e08bb467d8