Which company owns MAC address prefix C8:78:7D?

MAC address prefix C8:78:7D is registered to D-Link Corporation in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C8:78:7D has a network interface built by D-Link Corporation.

What is the OUI C8:78:7D?

C8:78:7D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to D-Link Corporation. It covers every address from C8:78:7D:00:00:00 to C8:78:7D:FF:FF:FF, or 16,777,216 addresses in total. It is also written C8-78-7D.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in C8:78:7D:00:00:00 that is C8:78:7D — 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 D-Link Corporation located?

D-Link Corporation is listed at No.289, Sinhu 3rd Rd., Neihu District, Taipei City TW 114 in the IEEE OUI registry entry for C8:78:7D. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does D-Link Corporation own?

D-Link Corporation holds 27 OUI prefixes in the IEEE registry, of which C8:78:7D is one. A device made by D-Link Corporation could carry a MAC address from any of them.

D-Link Corporation

MAC address prefix C8:78:7D is registered to D-Link Corporation in the IEEE OUI registry. Any device whose MAC address begins with C8:78:7D has a network interface built by D-Link 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 C8:78:7D:00:00:00 to C8:78:7D:FF:FF:FF.

OUI prefix: C8:78:7D
Hyphen form: C8-78-7D
MAC range: C8:78:7D:00:00:00 – C8:78:7D:FF:FF:FF
Addresses in block: 16,777,216
Organization: D-Link Corporation
Address: No.289, Sinhu 3rd Rd., Neihu District, Taipei City TW 114
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 D-Link Corporation

D-Link Corporation holds 27 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.

2023-07-11Assigned to "D-Link Corporation"
archived source →
2026-07-17Assigned to "D-Link Corporation"

Nearby in the registry

The prefixes assigned immediately before and after C8:78:7D:

FAQ

Which company owns MAC address prefix C8:78:7D?: MAC address prefix C8:78:7D is registered to D-Link Corporation in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C8:78:7D has a network interface built by D-Link Corporation.
What is the OUI C8:78:7D?: C8:78:7D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to D-Link Corporation. It covers every address from C8:78:7D:00:00:00 to C8:78:7D:FF:FF:FF, or 16,777,216 addresses in total. It is also written C8-78-7D.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in C8:78:7D:00:00:00 that is C8:78:7D — 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 D-Link Corporation located?: D-Link Corporation is listed at No.289, Sinhu 3rd Rd., Neihu District, Taipei City TW 114 in the IEEE OUI registry entry for C8:78:7D. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does D-Link Corporation own?: D-Link Corporation holds 27 OUI prefixes in the IEEE registry, of which C8:78:7D is one. A device made by D-Link Corporation could carry a MAC address from any of them.