World Wide Name

A World Wide Name (WWN) or World Wide Identifier (WWID) is a unique identifier which identifies a particular Fibre Channel, Advanced Technology Attachment (ATA) or Serial Attached SCSI (SAS) target. Each WWN is an 8 byte number derived from an IEEE OUI and vendor-supplied information.

There are two formats of WWN defined by the IEEE:

Original format: addresses are assigned to manufacturers by the IEEE standards committee, and are built into the device at build time, similar to an Ethernet MAC address. The first 2 bytes are either hex 10:00 or 2x:xx (where the x's are vendor-specified) followed by the 3-byte vendor identifier and 3 bytes for a vendor-specified serial number
New addressing schema: the first nibble is either hex 5 or 6 followed by a 3-byte vendor identifier and 36 bits for a vendor-specified serial number

Partial List of WWN Company Identifiers

00:50:76 IBM
00:17:38 IBM, formerly XIV.
00:A0:98 NetApp
00:60:69 Brocade Communications Systems
00:05:1E Brocade Communications Systems, formerly owned by Rhapsody Networks
00:60:DF Brocade Communications Systems, formerly CNT Technologies Corporation
00:05:30 Cisco
00:05:73 Cisco
00:05:9b Cisco
00:E0:8B QLogic HBAs, original identifier space
00:1B:32 QLogic HBAs. new identifier space starting to be used in 2007
00:C0:DD QLogic FC switches
00:90:66 QLogic formerly Troika Networks
00:11:75 QLogic formerly PathScale, Inc
08:00:88 Brocade Communications Systems, formerly McDATA Corporation. WWIDs begin with 1000.080
00:60:B0 Hewlett-Packard - Integrity and HP9000 servers. WWIDs begin with 5006.0b0
00:11:0A Hewlett-Packard - ProLiant servers. Formerly Compaq. WWIDs begin with 5001.10a
00:01:FE Hewlett-Packard - EVA disk arrays. Formerly Digital Equipment Corporation. WWIDs begin with 5000.1fe1 or 6000.1fe1
00:17:A4 Hewlett-Packard - MSL tape libraries. Formerly Global Data Services. WWIDs begin with 200x.0017.a4
00:60:48 EMC Corporation, for Symmetrix
00:60:16 EMC Corporation, for CLARiiON
00:10:86 ATTO Technology
00:23:29 DDRdrive LLC, for DDRdrive X1
00:A0:B8 Symbios Logic Inc.
00:0C:50 Seagate Technology
00:00:C9 Emulex
00:14:EE Western Digital