Determining the WWPN of a host that runs a Windows operating system depends on the type of HBA in your host server.
For QLogic, you can use the SANsurfer GUI/IBM FAStT Management Suite Java (MSJ) if you have it, or restart the host and enter Ctrl+Q to open the QLogic BIOS, where you can find the HBA WWPNs.
For Emulex hosts, use the elxcfg tool that is packaged with the firmware. This tool opens in the Windows operating system and does not require a restart.