Which company owns MAC address prefix 70:A3:A4?

MAC address prefix 70:A3:A4 is registered to Beijing Guming Communication Technology Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 70:A3:A4 has a network interface built by Beijing Guming Communication Technology Co., Ltd..

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 70:A3:A4:00:00:00 that is 70:A3:A4 — 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.

Beijing Guming Communication Technology Co., Ltd.

MAC address prefix 70:A3:A4 is registered to Beijing Guming Communication Technology Co., Ltd. in the IEEE OUI registry. Any device whose MAC address begins with 70:A3:A4 has a network interface built by Beijing Guming Communication 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 70:A3:A4:00:00:00 to 70:A3:A4:FF:FF:FF.

OUI prefix: 70:A3:A4
Hyphen form: 70-A3-A4
MAC range: 70:A3:A4:00:00:00 – 70:A3:A4:FF:FF:FF
Addresses in block: 16,777,216
Organization: Beijing Guming Communication Technology Co., Ltd.
Address: Room 202-6, 2nd Floor, Building 1, No. 8 Courtyard, Yongchang Middle Road, Beijing Economic and Technological Development Area, Beijing Beijing Beijing CN 100176
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.

2025-08-23Assigned to "Beijing Guming Communication Technology Co., Ltd."
archived source →
2026-07-17Assigned to "Beijing Guming Communication Technology Co., Ltd."

Nearby in the registry

The prefixes assigned immediately before and after 70:A3:A4:

FAQ

Which company owns MAC address prefix 70:A3:A4?: MAC address prefix 70:A3:A4 is registered to Beijing Guming Communication Technology Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 70:A3:A4 has a network interface built by Beijing Guming Communication Technology Co., Ltd..
What is the OUI 70:A3:A4?: 70:A3:A4 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Beijing Guming Communication Technology Co., Ltd.. It covers every address from 70:A3:A4:00:00:00 to 70:A3:A4:FF:FF:FF, or 16,777,216 addresses in total. It is also written 70-A3-A4.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 70:A3:A4:00:00:00 that is 70:A3:A4 — 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 Guming Communication Technology Co., Ltd. located?: Beijing Guming Communication Technology Co., Ltd. is listed at Room 202-6, 2nd Floor, Building 1, No. 8 Courtyard, Yongchang Middle Road, Beijing Economic and Technological Development Area, Beijing Beijing Beijing CN 100176 in the IEEE OUI registry entry for 70:A3:A4. This is the address the organization registered with the IEEE, which may differ from its current operating address.