Locating the WWPN for an HP-UX host You can locate the WWPN for an HP (Hewlett-Packard) HP-UX host by completing the following the steps. ProcedureGo to the root directory. Type: ioscan -fnC fc\ Look under the description for the Fibre Channel Mass Storage adapter. For example, look for the device path name /dev/td1 or /dev/fcms1. Type: fcmsutil/dev/td1 where /dev/td1 is the path.