Which company owns MAC address prefix C4:63:54?

MAC address prefix C4:63:54 is registered to U-Raku, Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C4:63:54 has a network interface built by U-Raku, Inc..

What is the OUI C4:63:54?

C4:63:54 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to U-Raku, Inc.. It covers every address from C4:63:54:00:00:00 to C4:63:54:FF:FF:FF, or 16,777,216 addresses in total. It is also written C4-63-54.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in C4:63:54:00:00:00 that is C4:63:54 — 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 U-Raku, Inc. located?

U-Raku, Inc. is listed at 401-1 Deba Ritto-shi Shiga JP 520-3041 in the IEEE OUI registry entry for C4:63:54. This is the address the organization registered with the IEEE, which may differ from its current operating address.

U-Raku, Inc.

MAC address prefix C4:63:54 is registered to U-Raku, Inc. in the IEEE OUI registry. Any device whose MAC address begins with C4:63:54 has a network interface built by U-Raku, Inc.. 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 C4:63:54:00:00:00 to C4:63:54:FF:FF:FF.

OUI prefix: C4:63:54
Hyphen form: C4-63-54
MAC range: C4:63:54:00:00:00 – C4:63:54:FF:FF:FF
Addresses in block: 16,777,216
Organization: U-Raku, Inc.
Address: 401-1 Deba Ritto-shi Shiga JP 520-3041
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 "U-Raku, Inc."
archived source →
2026-07-17Assigned to "U-Raku, Inc."

Nearby in the registry

The prefixes assigned immediately before and after C4:63:54:

FAQ

Which company owns MAC address prefix C4:63:54?: MAC address prefix C4:63:54 is registered to U-Raku, Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C4:63:54 has a network interface built by U-Raku, Inc..
What is the OUI C4:63:54?: C4:63:54 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to U-Raku, Inc.. It covers every address from C4:63:54:00:00:00 to C4:63:54:FF:FF:FF, or 16,777,216 addresses in total. It is also written C4-63-54.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in C4:63:54:00:00:00 that is C4:63:54 — 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 U-Raku, Inc. located?: U-Raku, Inc. is listed at 401-1 Deba Ritto-shi Shiga JP 520-3041 in the IEEE OUI registry entry for C4:63:54. This is the address the organization registered with the IEEE, which may differ from its current operating address.