Which company owns MAC address prefix 74:6A:B3?

MAC address prefix 74:6A:B3 is registered to MICIUS Laboratory in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 74:6A:B3 has a network interface built by MICIUS Laboratory.

What is the OUI 74:6A:B3?

74:6A:B3 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to MICIUS Laboratory. It covers every address from 74:6A:B3:00:00:00 to 74:6A:B3:FF:FF:FF, or 16,777,216 addresses in total. It is also written 74-6A-B3.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 74:6A:B3:00:00:00 that is 74:6A:B3 — 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 MICIUS Laboratory located?

MICIUS Laboratory is listed at Room 429, Henan Academy of Sciences,No.228 Chongshili, Zhengdong New District Zhengzhou City Henan Province CN 450046 in the IEEE OUI registry entry for 74:6A:B3. This is the address the organization registered with the IEEE, which may differ from its current operating address.

MICIUS Laboratory

MAC address prefix 74:6A:B3 is registered to MICIUS Laboratory in the IEEE OUI registry. Any device whose MAC address begins with 74:6A:B3 has a network interface built by MICIUS Laboratory. 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 74:6A:B3:00:00:00 to 74:6A:B3:FF:FF:FF.

OUI prefix: 74:6A:B3
Hyphen form: 74-6A-B3
MAC range: 74:6A:B3:00:00:00 – 74:6A:B3:FF:FF:FF
Addresses in block: 16,777,216
Organization: MICIUS Laboratory
Address: Room 429, Henan Academy of Sciences,No.228 Chongshili, Zhengdong New District Zhengzhou City Henan Province CN 450046
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.

2024-09-17Assigned to "MICIUS Laboratory"
archived source →
2026-07-17Assigned to "MICIUS Laboratory"

Nearby in the registry

The prefixes assigned immediately before and after 74:6A:B3:

FAQ

Which company owns MAC address prefix 74:6A:B3?: MAC address prefix 74:6A:B3 is registered to MICIUS Laboratory in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 74:6A:B3 has a network interface built by MICIUS Laboratory.
What is the OUI 74:6A:B3?: 74:6A:B3 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to MICIUS Laboratory. It covers every address from 74:6A:B3:00:00:00 to 74:6A:B3:FF:FF:FF, or 16,777,216 addresses in total. It is also written 74-6A-B3.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 74:6A:B3:00:00:00 that is 74:6A:B3 — 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 MICIUS Laboratory located?: MICIUS Laboratory is listed at Room 429, Henan Academy of Sciences,No.228 Chongshili, Zhengdong New District Zhengzhou City Henan Province CN 450046 in the IEEE OUI registry entry for 74:6A:B3. This is the address the organization registered with the IEEE, which may differ from its current operating address.