Which company owns MAC address prefix 28:0F:C5?

MAC address prefix 28:0F:C5 is registered to Beijing Leadsec Technology Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 28:0F:C5 has a network interface built by Beijing Leadsec Technology Co., Ltd..

What is the OUI 28:0F:C5?

28:0F:C5 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Beijing Leadsec Technology Co., Ltd.. It covers every address from 28:0F:C5:00:00:00 to 28:0F:C5:FF:FF:FF, or 16,777,216 addresses in total. It is also written 28-0F-C5.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 28:0F:C5:00:00:00 that is 28:0F:C5 — 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 Leadsec Technology Co., Ltd. located?

Beijing Leadsec Technology Co., Ltd. is listed at Venus Plaza No.21Zhongguancun Software Park,No.8 Dongbeiwang Xilu, Haidian District Beijing Beijing CN 100193 in the IEEE OUI registry entry for 28:0F:C5. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Beijing Leadsec Technology Co., Ltd.

MAC address prefix 28:0F:C5 is registered to Beijing Leadsec Technology Co., Ltd. in the IEEE OUI registry. Any device whose MAC address begins with 28:0F:C5 has a network interface built by Beijing Leadsec 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 28:0F:C5:00:00:00 to 28:0F:C5:FF:FF:FF.

OUI prefix: 28:0F:C5
Hyphen form: 28-0F-C5
MAC range: 28:0F:C5:00:00:00 – 28:0F:C5:FF:FF:FF
Addresses in block: 16,777,216
Organization: Beijing Leadsec Technology Co., Ltd.
Address: Venus Plaza No.21Zhongguancun Software Park,No.8 Dongbeiwang Xilu, Haidian District Beijing Beijing CN 100193
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.

2020-11-28Assigned to "Beijing Leadsec Technology Co., Ltd."
archived source →
2026-07-17Assigned to "Beijing Leadsec Technology Co., Ltd."

Nearby in the registry

The prefixes assigned immediately before and after 28:0F:C5:

FAQ

Which company owns MAC address prefix 28:0F:C5?: MAC address prefix 28:0F:C5 is registered to Beijing Leadsec Technology Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 28:0F:C5 has a network interface built by Beijing Leadsec Technology Co., Ltd..
What is the OUI 28:0F:C5?: 28:0F:C5 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Beijing Leadsec Technology Co., Ltd.. It covers every address from 28:0F:C5:00:00:00 to 28:0F:C5:FF:FF:FF, or 16,777,216 addresses in total. It is also written 28-0F-C5.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 28:0F:C5:00:00:00 that is 28:0F:C5 — 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 Leadsec Technology Co., Ltd. located?: Beijing Leadsec Technology Co., Ltd. is listed at Venus Plaza No.21Zhongguancun Software Park,No.8 Dongbeiwang Xilu, Haidian District Beijing Beijing CN 100193 in the IEEE OUI registry entry for 28:0F:C5. This is the address the organization registered with the IEEE, which may differ from its current operating address.