Which company owns MAC address prefix 20:3C:C0?

MAC address prefix 20:3C:C0 is registered to Beijing Tosee Technology Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 20:3C:C0 has a network interface built by Beijing Tosee Technology Co., Ltd..

What is the OUI 20:3C:C0?

20:3C:C0 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Beijing Tosee Technology Co., Ltd.. It covers every address from 20:3C:C0:00:00:00 to 20:3C:C0:FF:FF:FF, or 16,777,216 addresses in total. It is also written 20-3C-C0.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 20:3C:C0:00:00:00 that is 20:3C:C0 — 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 Beijing Tosee Technology Co., Ltd. located?

Beijing Tosee Technology Co., Ltd. is listed at Room S125, 1st Floor, Building 1, No. 9, Keyuan Road, Economic Development Zone, Daxing District beijing CN 102600 in the IEEE OUI registry entry for 20:3C:C0. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Beijing Tosee Technology Co., Ltd.

MAC address prefix 20:3C:C0 is registered to Beijing Tosee Technology Co., Ltd. in the IEEE OUI registry. Any device whose MAC address begins with 20:3C:C0 has a network interface built by Beijing Tosee 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 20:3C:C0:00:00:00 to 20:3C:C0:FF:FF:FF.

OUI prefix: 20:3C:C0
Hyphen form: 20-3C-C0
MAC range: 20:3C:C0:00:00:00 – 20:3C:C0:FF:FF:FF
Addresses in block: 16,777,216
Organization: Beijing Tosee Technology Co., Ltd.
Address: Room S125, 1st Floor, Building 1, No. 9, Keyuan Road, Economic Development Zone, Daxing District beijing CN 102600
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.

Assignment history (2)

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

2021-06-10Assigned to "Beijing Tosee Technology Co., Ltd."
archived source →
2026-07-17Assigned to "Beijing Tosee Technology Co., Ltd."

Nearby in the registry

The prefixes assigned immediately before and after 20:3C:C0:

FAQ

Which company owns MAC address prefix 20:3C:C0?: MAC address prefix 20:3C:C0 is registered to Beijing Tosee Technology Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 20:3C:C0 has a network interface built by Beijing Tosee Technology Co., Ltd..
What is the OUI 20:3C:C0?: 20:3C:C0 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Beijing Tosee Technology Co., Ltd.. It covers every address from 20:3C:C0:00:00:00 to 20:3C:C0:FF:FF:FF, or 16,777,216 addresses in total. It is also written 20-3C-C0.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 20:3C:C0:00:00:00 that is 20:3C:C0 — 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 Beijing Tosee Technology Co., Ltd. located?: Beijing Tosee Technology Co., Ltd. is listed at Room S125, 1st Floor, Building 1, No. 9, Keyuan Road, Economic Development Zone, Daxing District beijing CN 102600 in the IEEE OUI registry entry for 20:3C:C0. This is the address the organization registered with the IEEE, which may differ from its current operating address.