Which company owns MAC address prefix E4:8A:D5?

MAC address prefix E4:8A:D5 is registered to RF WINDOW CO., LTD. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with E4:8A:D5 has a network interface built by RF WINDOW CO., LTD..

What is the OUI E4:8A:D5?

E4:8A:D5 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to RF WINDOW CO., LTD.. It covers every address from E4:8A:D5:00:00:00 to E4:8A:D5:FF:FF:FF, or 16,777,216 addresses in total. It is also written E4-8A-D5.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in E4:8A:D5:00:00:00 that is E4:8A:D5 — 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 RF WINDOW CO., LTD. located?

RF WINDOW CO., LTD. is listed at 14F, Daerung Posttower3 Seoul KR 152-746 in the IEEE OUI registry entry for E4:8A:D5. This is the address the organization registered with the IEEE, which may differ from its current operating address.

RF WINDOW CO., LTD.

MAC address prefix E4:8A:D5 is registered to RF WINDOW CO., LTD. in the IEEE OUI registry. Any device whose MAC address begins with E4:8A:D5 has a network interface built by RF WINDOW 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 E4:8A:D5:00:00:00 to E4:8A:D5:FF:FF:FF.

OUI prefix: E4:8A:D5
Hyphen form: E4-8A-D5
MAC range: E4:8A:D5:00:00:00 – E4:8A:D5:FF:FF:FF
Addresses in block: 16,777,216
Organization: RF WINDOW CO., LTD.
Address: 14F, Daerung Posttower3 Seoul KR 152-746
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 "RF WINDOW CO., LTD."
archived source →
2026-07-17Assigned to "RF WINDOW CO., LTD."

Nearby in the registry

The prefixes assigned immediately before and after E4:8A:D5:

FAQ

Which company owns MAC address prefix E4:8A:D5?: MAC address prefix E4:8A:D5 is registered to RF WINDOW CO., LTD. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with E4:8A:D5 has a network interface built by RF WINDOW CO., LTD..
What is the OUI E4:8A:D5?: E4:8A:D5 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to RF WINDOW CO., LTD.. It covers every address from E4:8A:D5:00:00:00 to E4:8A:D5:FF:FF:FF, or 16,777,216 addresses in total. It is also written E4-8A-D5.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in E4:8A:D5:00:00:00 that is E4:8A:D5 — 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 RF WINDOW CO., LTD. located?: RF WINDOW CO., LTD. is listed at 14F, Daerung Posttower3 Seoul KR 152-746 in the IEEE OUI registry entry for E4:8A:D5. This is the address the organization registered with the IEEE, which may differ from its current operating address.