Which company owns MAC address prefix C0:21:0D?

MAC address prefix C0:21:0D is registered to SHENZHEN RF-LINK TECHNOLOGY CO.,LTD. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C0:21:0D has a network interface built by SHENZHEN RF-LINK TECHNOLOGY CO.,LTD..

What is the OUI C0:21:0D?

C0:21:0D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to SHENZHEN RF-LINK TECHNOLOGY CO.,LTD.. It covers every address from C0:21:0D:00:00:00 to C0:21:0D:FF:FF:FF, or 16,777,216 addresses in total. It is also written C0-21-0D.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in C0:21:0D:00:00:00 that is C0:21:0D — 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 SHENZHEN RF-LINK TECHNOLOGY CO.,LTD. located?

SHENZHEN RF-LINK TECHNOLOGY CO.,LTD. is listed at Bldg56A,6/F,Baotian Rd3,Xixiang Town,Baoan District, Shenzhen Guangdong CN 518000 in the IEEE OUI registry entry for C0:21:0D. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does SHENZHEN RF-LINK TECHNOLOGY CO.,LTD. own?

SHENZHEN RF-LINK TECHNOLOGY CO.,LTD. holds 12 OUI prefixes in the IEEE registry, of which C0:21:0D is one. A device made by SHENZHEN RF-LINK TECHNOLOGY CO.,LTD. could carry a MAC address from any of them.

SHENZHEN RF-LINK TECHNOLOGY CO.,LTD.

MAC address prefix C0:21:0D is registered to SHENZHEN RF-LINK TECHNOLOGY CO.,LTD. in the IEEE OUI registry. Any device whose MAC address begins with C0:21:0D has a network interface built by SHENZHEN RF-LINK TECHNOLOGY CO.,LTD.. 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 C0:21:0D:00:00:00 to C0:21:0D:FF:FF:FF.

OUI prefix: C0:21:0D
Hyphen form: C0-21-0D
MAC range: C0:21:0D:00:00:00 – C0:21:0D:FF:FF:FF
Addresses in block: 16,777,216
Organization: SHENZHEN RF-LINK TECHNOLOGY CO.,LTD.
Address: Bldg56A,6/F,Baotian Rd3,Xixiang Town,Baoan District, Shenzhen Guangdong CN 518000
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 SHENZHEN RF-LINK TECHNOLOGY CO.,LTD.

SHENZHEN RF-LINK TECHNOLOGY CO.,LTD. holds 12 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.

2017-09-08Assigned to "SHENZHEN RF-LINK TECHNOLOGY CO.,LTD."
archived source →
2026-07-17Assigned to "SHENZHEN RF-LINK TECHNOLOGY CO.,LTD."

Nearby in the registry

The prefixes assigned immediately before and after C0:21:0D:

FAQ

Which company owns MAC address prefix C0:21:0D?: MAC address prefix C0:21:0D is registered to SHENZHEN RF-LINK TECHNOLOGY CO.,LTD. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C0:21:0D has a network interface built by SHENZHEN RF-LINK TECHNOLOGY CO.,LTD..
What is the OUI C0:21:0D?: C0:21:0D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to SHENZHEN RF-LINK TECHNOLOGY CO.,LTD.. It covers every address from C0:21:0D:00:00:00 to C0:21:0D:FF:FF:FF, or 16,777,216 addresses in total. It is also written C0-21-0D.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in C0:21:0D:00:00:00 that is C0:21:0D — 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 SHENZHEN RF-LINK TECHNOLOGY CO.,LTD. located?: SHENZHEN RF-LINK TECHNOLOGY CO.,LTD. is listed at Bldg56A,6/F,Baotian Rd3,Xixiang Town,Baoan District, Shenzhen Guangdong CN 518000 in the IEEE OUI registry entry for C0:21:0D. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does SHENZHEN RF-LINK TECHNOLOGY CO.,LTD. own?: SHENZHEN RF-LINK TECHNOLOGY CO.,LTD. holds 12 OUI prefixes in the IEEE registry, of which C0:21:0D is one. A device made by SHENZHEN RF-LINK TECHNOLOGY CO.,LTD. could carry a MAC address from any of them.