Which company owns MAC address prefix E4:FF:69?

MAC address prefix E4:FF:69 is registered to Holiday Robotics in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with E4:FF:69 has a network interface built by Holiday Robotics.

What is the OUI E4:FF:69?

E4:FF:69 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Holiday Robotics. It covers every address from E4:FF:69:00:00:00 to E4:FF:69:FF:FF:FF, or 16,777,216 addresses in total. It is also written E4-FF-69.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in E4:FF:69:00:00:00 that is E4:FF:69 — 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 Holiday Robotics located?

Holiday Robotics is listed at 4F, 70, Nonhyeon-ro 85-gil, Gangnam-gu Seoul KR 06234 in the IEEE OUI registry entry for E4:FF:69. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Holiday Robotics

MAC address prefix E4:FF:69 is registered to Holiday Robotics in the IEEE OUI registry. Any device whose MAC address begins with E4:FF:69 has a network interface built by Holiday Robotics. 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:FF:69:00:00:00 to E4:FF:69:FF:FF:FF.

OUI prefix: E4:FF:69
Hyphen form: E4-FF-69
MAC range: E4:FF:69:00:00:00 – E4:FF:69:FF:FF:FF
Addresses in block: 16,777,216
Organization: Holiday Robotics
Address: 4F, 70, Nonhyeon-ro 85-gil, Gangnam-gu Seoul KR 06234
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.

2026-06-20Assigned to "Holiday Robotics"
archived source →
2026-07-17Assigned to "Holiday Robotics"

Nearby in the registry

The prefixes assigned immediately before and after E4:FF:69:

FAQ

Which company owns MAC address prefix E4:FF:69?: MAC address prefix E4:FF:69 is registered to Holiday Robotics in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with E4:FF:69 has a network interface built by Holiday Robotics.
What is the OUI E4:FF:69?: E4:FF:69 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Holiday Robotics. It covers every address from E4:FF:69:00:00:00 to E4:FF:69:FF:FF:FF, or 16,777,216 addresses in total. It is also written E4-FF-69.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in E4:FF:69:00:00:00 that is E4:FF:69 — 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 Holiday Robotics located?: Holiday Robotics is listed at 4F, 70, Nonhyeon-ro 85-gil, Gangnam-gu Seoul KR 06234 in the IEEE OUI registry entry for E4:FF:69. This is the address the organization registered with the IEEE, which may differ from its current operating address.