Which company owns MAC address prefix C4:AD:21?

MAC address prefix C4:AD:21 is registered to MEDIAEDGE Corporation in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C4:AD:21 has a network interface built by MEDIAEDGE Corporation.

What is the OUI C4:AD:21?

C4:AD:21 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to MEDIAEDGE Corporation. It covers every address from C4:AD:21:00:00:00 to C4:AD:21:FF:FF:FF, or 16,777,216 addresses in total. It is also written C4-AD-21.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in C4:AD:21:00:00:00 that is C4:AD:21 — 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 MEDIAEDGE Corporation located?

MEDIAEDGE Corporation is listed at 23F Kobe Commerce, Industry and Trade Center Bldg. Kobe Hyogo JP 651-0083 in the IEEE OUI registry entry for C4:AD:21. This is the address the organization registered with the IEEE, which may differ from its current operating address.

MEDIAEDGE Corporation

MAC address prefix C4:AD:21 is registered to MEDIAEDGE Corporation in the IEEE OUI registry. Any device whose MAC address begins with C4:AD:21 has a network interface built by MEDIAEDGE Corporation. 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:AD:21:00:00:00 to C4:AD:21:FF:FF:FF.

OUI prefix: C4:AD:21
Hyphen form: C4-AD-21
MAC range: C4:AD:21:00:00:00 – C4:AD:21:FF:FF:FF
Addresses in block: 16,777,216
Organization: MEDIAEDGE Corporation
Address: 23F Kobe Commerce, Industry and Trade Center Bldg. Kobe Hyogo JP 651-0083
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 "MEDIAEDGE Corporation"
archived source →
2026-07-17Assigned to "MEDIAEDGE Corporation"

Nearby in the registry

The prefixes assigned immediately before and after C4:AD:21:

FAQ

Which company owns MAC address prefix C4:AD:21?: MAC address prefix C4:AD:21 is registered to MEDIAEDGE Corporation in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C4:AD:21 has a network interface built by MEDIAEDGE Corporation.
What is the OUI C4:AD:21?: C4:AD:21 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to MEDIAEDGE Corporation. It covers every address from C4:AD:21:00:00:00 to C4:AD:21:FF:FF:FF, or 16,777,216 addresses in total. It is also written C4-AD-21.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in C4:AD:21:00:00:00 that is C4:AD:21 — 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 MEDIAEDGE Corporation located?: MEDIAEDGE Corporation is listed at 23F Kobe Commerce, Industry and Trade Center Bldg. Kobe Hyogo JP 651-0083 in the IEEE OUI registry entry for C4:AD:21. This is the address the organization registered with the IEEE, which may differ from its current operating address.