Which company owns MAC address prefix 48:21:6C?

MAC address prefix 48:21:6C is registered to China Mobile IOT Company Limited in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 48:21:6C has a network interface built by China Mobile IOT Company Limited.

What is the OUI 48:21:6C?

48:21:6C is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to China Mobile IOT Company Limited. It covers every address from 48:21:6C:00:00:00 to 48:21:6C:FF:FF:FF, or 16,777,216 addresses in total. It is also written 48-21-6C.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 48:21:6C:00:00:00 that is 48:21:6C — 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 China Mobile IOT Company Limited located?

China Mobile IOT Company Limited is listed at Building D3,No.8 Yangliu North Road,Yubei District CHONGQING CHONGQING CN 401121 in the IEEE OUI registry entry for 48:21:6C. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does China Mobile IOT Company Limited own?

China Mobile IOT Company Limited holds 24 OUI prefixes in the IEEE registry, of which 48:21:6C is one. A device made by China Mobile IOT Company Limited could carry a MAC address from any of them.

China Mobile IOT Company Limited

MAC address prefix 48:21:6C is registered to China Mobile IOT Company Limited in the IEEE OUI registry. Any device whose MAC address begins with 48:21:6C has a network interface built by China Mobile IOT Company 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 48:21:6C:00:00:00 to 48:21:6C:FF:FF:FF.

OUI prefix: 48:21:6C
Hyphen form: 48-21-6C
MAC range: 48:21:6C:00:00:00 – 48:21:6C:FF:FF:FF
Addresses in block: 16,777,216
Organization: China Mobile IOT Company Limited
Address: Building D3,No.8 Yangliu North Road,Yubei District CHONGQING CHONGQING CN 401121
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 China Mobile IOT Company Limited

China Mobile IOT Company Limited holds 24 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.

2019-07-04Assigned to "China Mobile IOT Company Limited"
archived source →
2026-07-17Assigned to "China Mobile IOT Company Limited"

Nearby in the registry

The prefixes assigned immediately before and after 48:21:6C:

FAQ

Which company owns MAC address prefix 48:21:6C?: MAC address prefix 48:21:6C is registered to China Mobile IOT Company Limited in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 48:21:6C has a network interface built by China Mobile IOT Company Limited.
What is the OUI 48:21:6C?: 48:21:6C is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to China Mobile IOT Company Limited. It covers every address from 48:21:6C:00:00:00 to 48:21:6C:FF:FF:FF, or 16,777,216 addresses in total. It is also written 48-21-6C.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 48:21:6C:00:00:00 that is 48:21:6C — 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 China Mobile IOT Company Limited located?: China Mobile IOT Company Limited is listed at Building D3,No.8 Yangliu North Road,Yubei District CHONGQING CHONGQING CN 401121 in the IEEE OUI registry entry for 48:21:6C. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does China Mobile IOT Company Limited own?: China Mobile IOT Company Limited holds 24 OUI prefixes in the IEEE registry, of which 48:21:6C is one. A device made by China Mobile IOT Company Limited could carry a MAC address from any of them.