World Wide Name

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A World Wide Name (WWN) or World Wide Identifier (WWID) is a unique identifier in a Fibre Channel or Serial Attached SCSI storage network. Each WWN is an 8-byte number derived from an IEEE OUI (for the first 3 bytes) and vendor-supplied information (for the rest).

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 Ethernet MAC address. 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: first half-byte is either hex 5 or 6 followed by a 3-byte vendor identifier and 4 bytes and a half for a vendor-specified serial number

[edit] List of a few WWN company identifiers

00:50:76 IBM
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: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
00:17:A4 Hewlett-Packard - MSL tape libraries. Formerly Global Data Services. WWIDs begin with 200x.0017.a4
00:60:48 EMC, for Symmetrix
00:60:16 EMC, for CLARiiON