Which company owns MAC address prefix C4:77:AF?

MAC address prefix C4:77:AF is registered to Advanced Digital Broadcast SA in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C4:77:AF has a network interface built by Advanced Digital Broadcast SA.

What is the OUI C4:77:AF?

C4:77:AF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Advanced Digital Broadcast SA. It covers every address from C4:77:AF:00:00:00 to C4:77:AF:FF:FF:FF, or 16,777,216 addresses in total. It is also written C4-77-AF.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in C4:77:AF:00:00:00 that is C4:77:AF — 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 Advanced Digital Broadcast SA located?

Advanced Digital Broadcast SA is listed at Route de Crassier 21, B2 Eysins CH CH-1262 in the IEEE OUI registry entry for C4:77:AF. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does Advanced Digital Broadcast SA own?

Advanced Digital Broadcast SA holds 3 OUI prefixes in the IEEE registry, of which C4:77:AF is one. A device made by Advanced Digital Broadcast SA could carry a MAC address from any of them.

Advanced Digital Broadcast SA

MAC address prefix C4:77:AF is registered to Advanced Digital Broadcast SA in the IEEE OUI registry. Any device whose MAC address begins with C4:77:AF has a network interface built by Advanced Digital Broadcast SA. 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 C4:77:AF:00:00:00 to C4:77:AF:FF:FF:FF.

OUI prefix: C4:77:AF
Hyphen form: C4-77-AF
MAC range: C4:77:AF:00:00:00 – C4:77:AF:FF:FF:FF
Addresses in block: 16,777,216
Organization: Advanced Digital Broadcast SA
Address: Route de Crassier 21, B2 Eysins CH CH-1262
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.

Other prefixes from Advanced Digital Broadcast SA

Advanced Digital Broadcast SA holds 3 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

Assignment history (2)

The IEEE registry publishes current state only — this is the change record we've kept since we started tracking it daily.

2018-12-21Assigned to "Advanced Digital Broadcast SA"
archived source →
2026-07-17Assigned to "Advanced Digital Broadcast SA"

Nearby in the registry

The prefixes assigned immediately before and after C4:77:AF:

FAQ

Which company owns MAC address prefix C4:77:AF?: MAC address prefix C4:77:AF is registered to Advanced Digital Broadcast SA in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C4:77:AF has a network interface built by Advanced Digital Broadcast SA.
What is the OUI C4:77:AF?: C4:77:AF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Advanced Digital Broadcast SA. It covers every address from C4:77:AF:00:00:00 to C4:77:AF:FF:FF:FF, or 16,777,216 addresses in total. It is also written C4-77-AF.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in C4:77:AF:00:00:00 that is C4:77:AF — 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 Advanced Digital Broadcast SA located?: Advanced Digital Broadcast SA is listed at Route de Crassier 21, B2 Eysins CH CH-1262 in the IEEE OUI registry entry for C4:77:AF. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Advanced Digital Broadcast SA own?: Advanced Digital Broadcast SA holds 3 OUI prefixes in the IEEE registry, of which C4:77:AF is one. A device made by Advanced Digital Broadcast SA could carry a MAC address from any of them.