Which company owns MAC address prefix A4:0D:BC?

MAC address prefix A4:0D:BC is registered to Xiamen Intretech Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A4:0D:BC has a network interface built by Xiamen Intretech Inc..

What is the OUI A4:0D:BC?

A4:0D:BC is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Xiamen Intretech Inc.. It covers every address from A4:0D:BC:00:00:00 to A4:0D:BC:FF:FF:FF, or 16,777,216 addresses in total. It is also written A4-0D-BC.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in A4:0D:BC:00:00:00 that is A4:0D:BC — 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 Xiamen Intretech Inc. located?

Xiamen Intretech Inc. is listed at FL 7 NO 588 JIAHE RD TORCH CARDEN HIGH-TECH ZONE Xiamen FUJIAN CN 361006 in the IEEE OUI registry entry for A4:0D:BC. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Xiamen Intretech Inc.

MAC address prefix A4:0D:BC is registered to Xiamen Intretech Inc. in the IEEE OUI registry. Any device whose MAC address begins with A4:0D:BC has a network interface built by Xiamen Intretech Inc.. 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 A4:0D:BC:00:00:00 to A4:0D:BC:FF:FF:FF.

OUI prefix: A4:0D:BC
Hyphen form: A4-0D-BC
MAC range: A4:0D:BC:00:00:00 – A4:0D:BC:FF:FF:FF
Addresses in block: 16,777,216
Organization: Xiamen Intretech Inc.
Address: FL 7 NO 588 JIAHE RD TORCH CARDEN HIGH-TECH ZONE Xiamen FUJIAN CN 361006
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.

Assignment history (2)

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 "Xiamen Intretech Inc."
archived source →
2026-07-17Assigned to "Xiamen Intretech Inc."

Nearby in the registry

The prefixes assigned immediately before and after A4:0D:BC:

FAQ

Which company owns MAC address prefix A4:0D:BC?: MAC address prefix A4:0D:BC is registered to Xiamen Intretech Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A4:0D:BC has a network interface built by Xiamen Intretech Inc..
What is the OUI A4:0D:BC?: A4:0D:BC is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Xiamen Intretech Inc.. It covers every address from A4:0D:BC:00:00:00 to A4:0D:BC:FF:FF:FF, or 16,777,216 addresses in total. It is also written A4-0D-BC.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in A4:0D:BC:00:00:00 that is A4:0D:BC — 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 Xiamen Intretech Inc. located?: Xiamen Intretech Inc. is listed at FL 7 NO 588 JIAHE RD TORCH CARDEN HIGH-TECH ZONE Xiamen FUJIAN CN 361006 in the IEEE OUI registry entry for A4:0D:BC. This is the address the organization registered with the IEEE, which may differ from its current operating address.