Which company owns MAC address prefix 88:C3:B2?

MAC address prefix 88:C3:B2 is registered to ROTEK LLC in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 88:C3:B2 has a network interface built by ROTEK LLC.

What is the OUI 88:C3:B2?

88:C3:B2 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to ROTEK LLC. It covers every address from 88:C3:B2:00:00:00 to 88:C3:B2:FF:FF:FF, or 16,777,216 addresses in total. It is also written 88-C3-B2.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 88:C3:B2:00:00:00 that is 88:C3:B2 — 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 ROTEK LLC located?

ROTEK LLC is listed at Room B 16/F Eubank Plaza 9 Chiu Lung Street, Central Hong Kong Hong Kong HK 999077 in the IEEE OUI registry entry for 88:C3:B2. This is the address the organization registered with the IEEE, which may differ from its current operating address.

ROTEK LLC

MAC address prefix 88:C3:B2 is registered to ROTEK LLC in the IEEE OUI registry. Any device whose MAC address begins with 88:C3:B2 has a network interface built by ROTEK LLC. 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 88:C3:B2:00:00:00 to 88:C3:B2:FF:FF:FF.

OUI prefix: 88:C3:B2
Hyphen form: 88-C3-B2
MAC range: 88:C3:B2:00:00:00 – 88:C3:B2:FF:FF:FF
Addresses in block: 16,777,216
Organization: ROTEK LLC
Address: Room B 16/F Eubank Plaza 9 Chiu Lung Street, Central Hong Kong Hong Kong HK 999077
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 (1)

The IEEE registry publishes current state only — this is the change record we've kept since we started tracking it daily.

2026-07-25Assigned to "ROTEK LLC"

Nearby in the registry

The prefixes assigned immediately before and after 88:C3:B2:

FAQ

Which company owns MAC address prefix 88:C3:B2?: MAC address prefix 88:C3:B2 is registered to ROTEK LLC in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 88:C3:B2 has a network interface built by ROTEK LLC.
What is the OUI 88:C3:B2?: 88:C3:B2 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to ROTEK LLC. It covers every address from 88:C3:B2:00:00:00 to 88:C3:B2:FF:FF:FF, or 16,777,216 addresses in total. It is also written 88-C3-B2.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 88:C3:B2:00:00:00 that is 88:C3:B2 — 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 ROTEK LLC located?: ROTEK LLC is listed at Room B 16/F Eubank Plaza 9 Chiu Lung Street, Central Hong Kong Hong Kong HK 999077 in the IEEE OUI registry entry for 88:C3:B2. This is the address the organization registered with the IEEE, which may differ from its current operating address.