Which company owns MAC address prefix 02:C0:8C?

MAC address prefix 02:C0:8C is registered to 3COM in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 02:C0:8C has a network interface built by 3COM.

What is the OUI 02:C0:8C?

02:C0:8C is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to 3COM. It covers every address from 02:C0:8C:00:00:00 to 02:C0:8C:FF:FF:FF, or 16,777,216 addresses in total. It is also written 02-C0-8C.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 02:C0:8C:00:00:00 that is 02:C0:8C — and look that prefix up in the IEEE OUI registry. If the second-lowest bit of the first octet is set, the address is locally administered (a randomized or private MAC), which belongs to no manufacturer and will not resolve; modern phones and laptops use these by default on each network.

Where is 3COM located?

3COM is listed at 5400 BAYFRONT PLAZA SANTA CLARA CA US 95052 in the IEEE OUI registry entry for 02:C0:8C. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does 3COM own?

3COM holds 20 OUI prefixes in the IEEE registry, of which 02:C0:8C is one. A device made by 3COM could carry a MAC address from any of them.

3COM

MAC address prefix 02:C0:8C is registered to 3COM in the IEEE OUI registry. Any device whose MAC address begins with 02:C0:8C has a network interface built by 3COM. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address — it covers every MAC from 02:C0:8C:00:00:00 to 02:C0:8C:FF:FF:FF.

OUI prefix: 02:C0:8C
Hyphen form: 02-C0-8C
MAC range: 02:C0:8C:00:00:00 – 02:C0:8C:FF:FF:FF
Addresses in block: 16,777,216
Organization: 3COM
Address: 5400 BAYFRONT PLAZA SANTA CLARA CA US 95052
Source: IEEE OUI registry

Have a full MAC address? Look it up— we'll also tell you if it's a randomized (private) address rather than a real manufacturer prefix.

Other prefixes from 3COM

3COM holds 20 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

Assignment history (3)

The IEEE registry publishes current state only — this is the change record we've kept since we started tracking it daily.

2016-07-29Assigned to "3COM CORPORATION"
archived source →
2018-12-21Renamed from "3COM CORPORATION" to "3COM"
archived source →
2026-07-17Assigned to "3COM"

Nearby in the registry

The prefixes assigned immediately before and after 02:C0:8C:

FAQ

Which company owns MAC address prefix 02:C0:8C?: MAC address prefix 02:C0:8C is registered to 3COM in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 02:C0:8C has a network interface built by 3COM.
What is the OUI 02:C0:8C?: 02:C0:8C is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to 3COM. It covers every address from 02:C0:8C:00:00:00 to 02:C0:8C:FF:FF:FF, or 16,777,216 addresses in total. It is also written 02-C0-8C.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 02:C0:8C:00:00:00 that is 02:C0:8C — and look that prefix up in the IEEE OUI registry. If the second-lowest bit of the first octet is set, the address is locally administered (a randomized or private MAC), which belongs to no manufacturer and will not resolve; modern phones and laptops use these by default on each network.
Where is 3COM located?: 3COM is listed at 5400 BAYFRONT PLAZA SANTA CLARA CA US 95052 in the IEEE OUI registry entry for 02:C0:8C. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does 3COM own?: 3COM holds 20 OUI prefixes in the IEEE registry, of which 02:C0:8C is one. A device made by 3COM could carry a MAC address from any of them.