The below command can be used starting from server 2012 and up and it will list the WWN of a storage controller.
Server 2012 or higher
PortAddress is the WWN on this dual port FC adapter
PS C:\Get-InitiatorPort
Server 2008 or older
On older versions of Windows you can install fcinfo from Microsoft. Before going this route I would first open up MMC > Add Storage snap-in and see if you an get the WWN details from there or you can
FCinfo download link
https://www.microsoft.com/en-us/download/details.aspx?id=17530
