Which company owns MAC address prefix 44:AA:27?

MAC address prefix 44:AA:27 is registered to udworks Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 44:AA:27 has a network interface built by udworks Co., Ltd..

What is the OUI 44:AA:27?

44:AA:27 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to udworks Co., Ltd.. It covers every address from 44:AA:27:00:00:00 to 44:AA:27:FF:FF:FF, or 16,777,216 addresses in total. It is also written 44-AA-27.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 44:AA:27:00:00:00 that is 44:AA:27 — 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 udworks Co., Ltd. located?

udworks Co., Ltd. is listed at #810, Byuksan3cha Digital Valley, 212-13, Guro-dong, Guro-gu Seoul KR 152-775 in the IEEE OUI registry entry for 44:AA:27. This is the address the organization registered with the IEEE, which may differ from its current operating address.

udworks Co., Ltd.

MAC address prefix 44:AA:27 is registered to udworks Co., Ltd. in the IEEE OUI registry. Any device whose MAC address begins with 44:AA:27 has a network interface built by udworks 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:AA:27:00:00:00 to 44:AA:27:FF:FF:FF.

OUI prefix: 44:AA:27
Hyphen form: 44-AA-27
MAC range: 44:AA:27:00:00:00 – 44:AA:27:FF:FF:FF
Addresses in block: 16,777,216
Organization: udworks Co., Ltd.
Address: #810, Byuksan3cha Digital Valley, 212-13, Guro-dong, Guro-gu Seoul KR 152-775
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 "udworks Co., Ltd."
archived source →
2026-07-17Assigned to "udworks Co., Ltd."

Nearby in the registry

The prefixes assigned immediately before and after 44:AA:27:

FAQ

Which company owns MAC address prefix 44:AA:27?: MAC address prefix 44:AA:27 is registered to udworks Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 44:AA:27 has a network interface built by udworks Co., Ltd..
What is the OUI 44:AA:27?: 44:AA:27 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to udworks Co., Ltd.. It covers every address from 44:AA:27:00:00:00 to 44:AA:27:FF:FF:FF, or 16,777,216 addresses in total. It is also written 44-AA-27.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 44:AA:27:00:00:00 that is 44:AA:27 — 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 udworks Co., Ltd. located?: udworks Co., Ltd. is listed at #810, Byuksan3cha Digital Valley, 212-13, Guro-dong, Guro-gu Seoul KR 152-775 in the IEEE OUI registry entry for 44:AA:27. This is the address the organization registered with the IEEE, which may differ from its current operating address.