Which company owns MAC address prefix 2C:A1:57?

MAC address prefix 2C:A1:57 is registered to acromate, Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 2C:A1:57 has a network interface built by acromate, Inc..

What is the OUI 2C:A1:57?

2C:A1:57 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to acromate, Inc.. It covers every address from 2C:A1:57:00:00:00 to 2C:A1:57:FF:FF:FF, or 16,777,216 addresses in total. It is also written 2C-A1-57.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 2C:A1:57:00:00:00 that is 2C:A1:57 — 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 acromate, Inc. located?

acromate, Inc. is listed at #1101, JnK Digital Tower, 111 Seoul KR 152-848 in the IEEE OUI registry entry for 2C:A1:57. This is the address the organization registered with the IEEE, which may differ from its current operating address.

acromate, Inc.

MAC address prefix 2C:A1:57 is registered to acromate, Inc. in the IEEE OUI registry. Any device whose MAC address begins with 2C:A1:57 has a network interface built by acromate, 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 2C:A1:57:00:00:00 to 2C:A1:57:FF:FF:FF.

OUI prefix: 2C:A1:57
Hyphen form: 2C-A1-57
MAC range: 2C:A1:57:00:00:00 – 2C:A1:57:FF:FF:FF
Addresses in block: 16,777,216
Organization: acromate, Inc.
Address: #1101, JnK Digital Tower, 111 Seoul KR 152-848
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 "acromate, Inc."
archived source →
2026-07-17Assigned to "acromate, Inc."

Nearby in the registry

The prefixes assigned immediately before and after 2C:A1:57:

FAQ

Which company owns MAC address prefix 2C:A1:57?: MAC address prefix 2C:A1:57 is registered to acromate, Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 2C:A1:57 has a network interface built by acromate, Inc..
What is the OUI 2C:A1:57?: 2C:A1:57 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to acromate, Inc.. It covers every address from 2C:A1:57:00:00:00 to 2C:A1:57:FF:FF:FF, or 16,777,216 addresses in total. It is also written 2C-A1-57.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 2C:A1:57:00:00:00 that is 2C:A1:57 — 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 acromate, Inc. located?: acromate, Inc. is listed at #1101, JnK Digital Tower, 111 Seoul KR 152-848 in the IEEE OUI registry entry for 2C:A1:57. This is the address the organization registered with the IEEE, which may differ from its current operating address.