Which company owns MAC address prefix C4:30:CA?

MAC address prefix C4:30:CA is registered to SD Biosensor in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C4:30:CA has a network interface built by SD Biosensor.

What is the OUI C4:30:CA?

C4:30:CA is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to SD Biosensor. It covers every address from C4:30:CA:00:00:00 to C4:30:CA:FF:FF:FF, or 16,777,216 addresses in total. It is also written C4-30-CA.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in C4:30:CA:00:00:00 that is C4:30:CA — 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 SD Biosensor located?

SD Biosensor is listed at C-4th & 5th Floor, Digital Empire Building, 980-3 Suwon-si Kyonggi-do KR ASI|KR|KS002|SUWON in the IEEE OUI registry entry for C4:30:CA. This is the address the organization registered with the IEEE, which may differ from its current operating address.

SD Biosensor

MAC address prefix C4:30:CA is registered to SD Biosensor in the IEEE OUI registry. Any device whose MAC address begins with C4:30:CA has a network interface built by SD Biosensor. 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 C4:30:CA:00:00:00 to C4:30:CA:FF:FF:FF.

OUI prefix: C4:30:CA
Hyphen form: C4-30-CA
MAC range: C4:30:CA:00:00:00 – C4:30:CA:FF:FF:FF
Addresses in block: 16,777,216
Organization: SD Biosensor
Address: C-4th & 5th Floor, Digital Empire Building, 980-3 Suwon-si Kyonggi-do KR ASI|KR|KS002|SUWON
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.

2020-11-28Assigned to "SD Biosensor"
archived source →
2026-07-17Assigned to "SD Biosensor"

Nearby in the registry

The prefixes assigned immediately before and after C4:30:CA:

FAQ

Which company owns MAC address prefix C4:30:CA?: MAC address prefix C4:30:CA is registered to SD Biosensor in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C4:30:CA has a network interface built by SD Biosensor.
What is the OUI C4:30:CA?: C4:30:CA is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to SD Biosensor. It covers every address from C4:30:CA:00:00:00 to C4:30:CA:FF:FF:FF, or 16,777,216 addresses in total. It is also written C4-30-CA.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in C4:30:CA:00:00:00 that is C4:30:CA — 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 SD Biosensor located?: SD Biosensor is listed at C-4th & 5th Floor, Digital Empire Building, 980-3 Suwon-si Kyonggi-do KR ASI|KR|KS002|SUWON in the IEEE OUI registry entry for C4:30:CA. This is the address the organization registered with the IEEE, which may differ from its current operating address.