Which company owns MAC address prefix C0:DF:77?

MAC address prefix C0:DF:77 is registered to Conrad Electronic SE in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C0:DF:77 has a network interface built by Conrad Electronic SE.

What is the OUI C0:DF:77?

C0:DF:77 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Conrad Electronic SE. It covers every address from C0:DF:77:00:00:00 to C0:DF:77:FF:FF:FF, or 16,777,216 addresses in total. It is also written C0-DF-77.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in C0:DF:77:00:00:00 that is C0:DF:77 — 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 Conrad Electronic SE located?

Conrad Electronic SE is listed at Klaus Conrad Str. 1 Hirschau Bavaria DE 92240 in the IEEE OUI registry entry for C0:DF:77. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Conrad Electronic SE

MAC address prefix C0:DF:77 is registered to Conrad Electronic SE in the IEEE OUI registry. Any device whose MAC address begins with C0:DF:77 has a network interface built by Conrad Electronic SE. 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 C0:DF:77:00:00:00 to C0:DF:77:FF:FF:FF.

OUI prefix: C0:DF:77
Hyphen form: C0-DF-77
MAC range: C0:DF:77:00:00:00 – C0:DF:77:FF:FF:FF
Addresses in block: 16,777,216
Organization: Conrad Electronic SE
Address: Klaus Conrad Str. 1 Hirschau Bavaria DE 92240
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 "Conrad Electronic SE"
archived source →
2026-07-17Assigned to "Conrad Electronic SE"

Nearby in the registry

The prefixes assigned immediately before and after C0:DF:77:

FAQ

Which company owns MAC address prefix C0:DF:77?: MAC address prefix C0:DF:77 is registered to Conrad Electronic SE in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C0:DF:77 has a network interface built by Conrad Electronic SE.
What is the OUI C0:DF:77?: C0:DF:77 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Conrad Electronic SE. It covers every address from C0:DF:77:00:00:00 to C0:DF:77:FF:FF:FF, or 16,777,216 addresses in total. It is also written C0-DF-77.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in C0:DF:77:00:00:00 that is C0:DF:77 — 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 Conrad Electronic SE located?: Conrad Electronic SE is listed at Klaus Conrad Str. 1 Hirschau Bavaria DE 92240 in the IEEE OUI registry entry for C0:DF:77. This is the address the organization registered with the IEEE, which may differ from its current operating address.