Which company owns MAC address prefix 20:D5:AB?

MAC address prefix 20:D5:AB is registered to Korea Infocom Co.,Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 20:D5:AB has a network interface built by Korea Infocom Co.,Ltd..

What is the OUI 20:D5:AB?

20:D5:AB is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Korea Infocom Co.,Ltd.. It covers every address from 20:D5:AB:00:00:00 to 20:D5:AB:FF:FF:FF, or 16,777,216 addresses in total. It is also written 20-D5-AB.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 20:D5:AB:00:00:00 that is 20:D5:AB — 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 Korea Infocom Co.,Ltd. located?

Korea Infocom Co.,Ltd. is listed at 5F Wintek B/D 511 Uiwang Kyunggi-Do KR 437-830 in the IEEE OUI registry entry for 20:D5:AB. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Korea Infocom Co.,Ltd.

MAC address prefix 20:D5:AB is registered to Korea Infocom Co.,Ltd. in the IEEE OUI registry. Any device whose MAC address begins with 20:D5:AB has a network interface built by Korea Infocom 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 20:D5:AB:00:00:00 to 20:D5:AB:FF:FF:FF.

OUI prefix: 20:D5:AB
Hyphen form: 20-D5-AB
MAC range: 20:D5:AB:00:00:00 – 20:D5:AB:FF:FF:FF
Addresses in block: 16,777,216
Organization: Korea Infocom Co.,Ltd.
Address: 5F Wintek B/D 511 Uiwang Kyunggi-Do KR 437-830
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 "Korea Infocom Co.,Ltd."
archived source →
2026-07-17Assigned to "Korea Infocom Co.,Ltd."

Nearby in the registry

The prefixes assigned immediately before and after 20:D5:AB:

FAQ

Which company owns MAC address prefix 20:D5:AB?: MAC address prefix 20:D5:AB is registered to Korea Infocom Co.,Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 20:D5:AB has a network interface built by Korea Infocom Co.,Ltd..
What is the OUI 20:D5:AB?: 20:D5:AB is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Korea Infocom Co.,Ltd.. It covers every address from 20:D5:AB:00:00:00 to 20:D5:AB:FF:FF:FF, or 16,777,216 addresses in total. It is also written 20-D5-AB.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 20:D5:AB:00:00:00 that is 20:D5:AB — 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 Korea Infocom Co.,Ltd. located?: Korea Infocom Co.,Ltd. is listed at 5F Wintek B/D 511 Uiwang Kyunggi-Do KR 437-830 in the IEEE OUI registry entry for 20:D5:AB. This is the address the organization registered with the IEEE, which may differ from its current operating address.