Which company owns MAC address prefix C4:A4:51?

MAC address prefix C4:A4:51 is registered to TECNO MOBILE LIMITED in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C4:A4:51 has a network interface built by TECNO MOBILE LIMITED.

What is the OUI C4:A4:51?

C4:A4:51 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to TECNO MOBILE LIMITED. It covers every address from C4:A4:51:00:00:00 to C4:A4:51:FF:FF:FF, or 16,777,216 addresses in total. It is also written C4-A4-51.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in C4:A4:51:00:00:00 that is C4:A4:51 — 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 TECNO MOBILE LIMITED located?

TECNO MOBILE LIMITED is listed at ROOMS 05-15, 13A/F., SOUTH TOWER, WORLD FINANCE CENTRE, HARBOUR CITY, 17 CANTON ROAD, TSIM SHA TSUI, KOWLOON, HONG KONG Hong Kong Hong Kong HK 999077 in the IEEE OUI registry entry for C4:A4:51. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does TECNO MOBILE LIMITED own?

TECNO MOBILE LIMITED holds 54 OUI prefixes in the IEEE registry, of which C4:A4:51 is one. A device made by TECNO MOBILE LIMITED could carry a MAC address from any of them.

TECNO MOBILE LIMITED

MAC address prefix C4:A4:51 is registered to TECNO MOBILE LIMITED in the IEEE OUI registry. Any device whose MAC address begins with C4:A4:51 has a network interface built by TECNO MOBILE LIMITED. 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:A4:51:00:00:00 to C4:A4:51:FF:FF:FF.

OUI prefix: C4:A4:51
Hyphen form: C4-A4-51
MAC range: C4:A4:51:00:00:00 – C4:A4:51:FF:FF:FF
Addresses in block: 16,777,216
Organization: TECNO MOBILE LIMITED
Address: ROOMS 05-15, 13A/F., SOUTH TOWER, WORLD FINANCE CENTRE, HARBOUR CITY, 17 CANTON ROAD, TSIM SHA TSUI, KOWLOON, HONG KONG Hong Kong Hong Kong HK 999077
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 TECNO MOBILE LIMITED

TECNO MOBILE LIMITED holds 54 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.

2024-02-15Assigned to "TECNO MOBILE LIMITED"
archived source →
2026-07-17Assigned to "TECNO MOBILE LIMITED"

Nearby in the registry

The prefixes assigned immediately before and after C4:A4:51:

FAQ

Which company owns MAC address prefix C4:A4:51?: MAC address prefix C4:A4:51 is registered to TECNO MOBILE LIMITED in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C4:A4:51 has a network interface built by TECNO MOBILE LIMITED.
What is the OUI C4:A4:51?: C4:A4:51 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to TECNO MOBILE LIMITED. It covers every address from C4:A4:51:00:00:00 to C4:A4:51:FF:FF:FF, or 16,777,216 addresses in total. It is also written C4-A4-51.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in C4:A4:51:00:00:00 that is C4:A4:51 — 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 TECNO MOBILE LIMITED located?: TECNO MOBILE LIMITED is listed at ROOMS 05-15, 13A/F., SOUTH TOWER, WORLD FINANCE CENTRE, HARBOUR CITY, 17 CANTON ROAD, TSIM SHA TSUI, KOWLOON, HONG KONG Hong Kong Hong Kong HK 999077 in the IEEE OUI registry entry for C4:A4:51. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does TECNO MOBILE LIMITED own?: TECNO MOBILE LIMITED holds 54 OUI prefixes in the IEEE registry, of which C4:A4:51 is one. A device made by TECNO MOBILE LIMITED could carry a MAC address from any of them.