Which company owns MAC address prefix 44:42:2F?

MAC address prefix 44:42:2F is registered to TESTOP CO.,LTD. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 44:42:2F has a network interface built by TESTOP CO.,LTD..

What is the OUI 44:42:2F?

44:42:2F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to TESTOP CO.,LTD.. It covers every address from 44:42:2F:00:00:00 to 44:42:2F:FF:FF:FF, or 16,777,216 addresses in total. It is also written 44-42-2F.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 44:42:2F:00:00:00 that is 44:42:2F — 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 TESTOP CO.,LTD. located?

TESTOP CO.,LTD. is listed at 808RM Hanshin IT Tower ,272, Digital-ro Guro-gu Seoul KR 08389 in the IEEE OUI registry entry for 44:42:2F. This is the address the organization registered with the IEEE, which may differ from its current operating address.

TESTOP CO.,LTD.

MAC address prefix 44:42:2F is registered to TESTOP CO.,LTD. in the IEEE OUI registry. Any device whose MAC address begins with 44:42:2F has a network interface built by TESTOP 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 44:42:2F:00:00:00 to 44:42:2F:FF:FF:FF.

OUI prefix: 44:42:2F
Hyphen form: 44-42-2F
MAC range: 44:42:2F:00:00:00 – 44:42:2F:FF:FF:FF
Addresses in block: 16,777,216
Organization: TESTOP CO.,LTD.
Address: 808RM Hanshin IT Tower ,272, Digital-ro Guro-gu Seoul KR 08389
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.

2019-07-04Assigned to "TESTOP CO.,LTD."
archived source →
2026-07-17Assigned to "TESTOP CO.,LTD."

Nearby in the registry

The prefixes assigned immediately before and after 44:42:2F:

FAQ

Which company owns MAC address prefix 44:42:2F?: MAC address prefix 44:42:2F is registered to TESTOP CO.,LTD. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 44:42:2F has a network interface built by TESTOP CO.,LTD..
What is the OUI 44:42:2F?: 44:42:2F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to TESTOP CO.,LTD.. It covers every address from 44:42:2F:00:00:00 to 44:42:2F:FF:FF:FF, or 16,777,216 addresses in total. It is also written 44-42-2F.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 44:42:2F:00:00:00 that is 44:42:2F — 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 TESTOP CO.,LTD. located?: TESTOP CO.,LTD. is listed at 808RM Hanshin IT Tower ,272, Digital-ro Guro-gu Seoul KR 08389 in the IEEE OUI registry entry for 44:42:2F. This is the address the organization registered with the IEEE, which may differ from its current operating address.