Which company owns MAC address prefix C4:7A:5D?

MAC address prefix C4:7A:5D is registered to Panmnesia Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C4:7A:5D has a network interface built by Panmnesia Inc..

What is the OUI C4:7A:5D?

C4:7A:5D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Panmnesia Inc.. It covers every address from C4:7A:5D:00:00:00 to C4:7A:5D:FF:FF:FF, or 16,777,216 addresses in total. It is also written C4-7A-5D.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in C4:7A:5D:00:00:00 that is C4:7A:5D — 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 Panmnesia Inc. located?

Panmnesia Inc. is listed at 1, Expo-ro, Yuseong-gu Daejeon KR 34126 in the IEEE OUI registry entry for C4:7A:5D. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Panmnesia Inc.

MAC address prefix C4:7A:5D is registered to Panmnesia Inc. in the IEEE OUI registry. Any device whose MAC address begins with C4:7A:5D has a network interface built by Panmnesia 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 C4:7A:5D:00:00:00 to C4:7A:5D:FF:FF:FF.

OUI prefix: C4:7A:5D
Hyphen form: C4-7A-5D
MAC range: C4:7A:5D:00:00:00 – C4:7A:5D:FF:FF:FF
Addresses in block: 16,777,216
Organization: Panmnesia Inc.
Address: 1, Expo-ro, Yuseong-gu Daejeon KR 34126
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.

2026-07-17Assigned to "Panmnesia Inc."

Nearby in the registry

The prefixes assigned immediately before and after C4:7A:5D:

FAQ

Which company owns MAC address prefix C4:7A:5D?: MAC address prefix C4:7A:5D is registered to Panmnesia Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C4:7A:5D has a network interface built by Panmnesia Inc..
What is the OUI C4:7A:5D?: C4:7A:5D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Panmnesia Inc.. It covers every address from C4:7A:5D:00:00:00 to C4:7A:5D:FF:FF:FF, or 16,777,216 addresses in total. It is also written C4-7A-5D.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in C4:7A:5D:00:00:00 that is C4:7A:5D — 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 Panmnesia Inc. located?: Panmnesia Inc. is listed at 1, Expo-ro, Yuseong-gu Daejeon KR 34126 in the IEEE OUI registry entry for C4:7A:5D. This is the address the organization registered with the IEEE, which may differ from its current operating address.