IBM

IBM holds 4 OUI prefixes in the IEEE registry. Each prefix is the first three octets of a MAC address and covers a block of 16,777,216 addresses, so devices built by IBM draw from a pool of about 67,108,864 possible MAC addresses in total.

Registered address: 3039 E Cornwallis Rd Research Triangle Park NC US 27709

All 4 prefixes

• 34:40:B534:40:B5:00:00:00 – 34:40:B5:FF:FF:FF
• 40:F2:E940:F2:E9:00:00:00 – 40:F2:E9:FF:FF:FF
• 98:BE:9498:BE:94:00:00:00 – 98:BE:94:FF:FF:FF
• A8:97:DCA8:97:DC:00:00:00 – A8:97:DC:FF:FF:FF

Have a full MAC address? Look it up to see which of these prefixes it belongs to — or browse the full manufacturer directory.