3Com Ltd

3Com Ltd holds 11 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 3Com Ltd draw from a pool of about 184,549,376 possible MAC addresses in total.

Registered address: Peoplebuilding 2 Hemel Hempstead Herts GB HP2 4NW

All 11 prefixes

• 00:0A:0400:0A:04:00:00:00 – 00:0A:04:FF:FF:FF
• 00:0B:AC00:0B:AC:00:00:00 – 00:0B:AC:FF:FF:FF
• 00:0D:5400:0D:54:00:00:00 – 00:0D:54:FF:FF:FF
• 00:0E:6A00:0E:6A:00:00:00 – 00:0E:6A:FF:FF:FF
• 00:0F:CB00:0F:CB:00:00:00 – 00:0F:CB:FF:FF:FF
• 00:12:A900:12:A9:00:00:00 – 00:12:A9:FF:FF:FF
• 00:14:7C00:14:7C:00:00:00 – 00:14:7C:FF:FF:FF
• 00:16:E000:16:E0:00:00:00 – 00:16:E0:FF:FF:FF
• 00:18:6E00:18:6E:00:00:00 – 00:18:6E:FF:FF:FF
• 00:1A:C100:1A:C1:00:00:00 – 00:1A:C1:FF:FF:FF
• 00:1C:C500:1C:C5:00:00:00 – 00:1C:C5: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.