Which company owns MAC address prefix A0:5D:C1?

MAC address prefix A0:5D:C1 is registered to TMCT Co., LTD. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A0:5D:C1 has a network interface built by TMCT Co., LTD..

What is the OUI A0:5D:C1?

A0:5D:C1 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to TMCT Co., LTD.. It covers every address from A0:5D:C1:00:00:00 to A0:5D:C1:FF:FF:FF, or 16,777,216 addresses in total. It is also written A0-5D-C1.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in A0:5D:C1:00:00:00 that is A0:5D:C1 — 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 TMCT Co., LTD. located?

TMCT Co., LTD. is listed at 5F-561, #19-11 SanChong Rd. Taipei TW 115 in the IEEE OUI registry entry for A0:5D:C1. This is the address the organization registered with the IEEE, which may differ from its current operating address.

TMCT Co., LTD.

MAC address prefix A0:5D:C1 is registered to TMCT Co., LTD. in the IEEE OUI registry. Any device whose MAC address begins with A0:5D:C1 has a network interface built by TMCT Co., LTD.. 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 A0:5D:C1:00:00:00 to A0:5D:C1:FF:FF:FF.

OUI prefix: A0:5D:C1
Hyphen form: A0-5D-C1
MAC range: A0:5D:C1:00:00:00 – A0:5D:C1:FF:FF:FF
Addresses in block: 16,777,216
Organization: TMCT Co., LTD.
Address: 5F-561, #19-11 SanChong Rd. Taipei TW 115
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 "TMCT Co., LTD."
archived source →
2026-07-17Assigned to "TMCT Co., LTD."

Nearby in the registry

The prefixes assigned immediately before and after A0:5D:C1:

FAQ

Which company owns MAC address prefix A0:5D:C1?: MAC address prefix A0:5D:C1 is registered to TMCT Co., LTD. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A0:5D:C1 has a network interface built by TMCT Co., LTD..
What is the OUI A0:5D:C1?: A0:5D:C1 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to TMCT Co., LTD.. It covers every address from A0:5D:C1:00:00:00 to A0:5D:C1:FF:FF:FF, or 16,777,216 addresses in total. It is also written A0-5D-C1.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in A0:5D:C1:00:00:00 that is A0:5D:C1 — 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 TMCT Co., LTD. located?: TMCT Co., LTD. is listed at 5F-561, #19-11 SanChong Rd. Taipei TW 115 in the IEEE OUI registry entry for A0:5D:C1. This is the address the organization registered with the IEEE, which may differ from its current operating address.