Which company owns MAC address prefix C4:F1:D1?

MAC address prefix C4:F1:D1 is registered to BEIJING SOGOU TECHNOLOGY DEVELOPMENT CO., LTD. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C4:F1:D1 has a network interface built by BEIJING SOGOU TECHNOLOGY DEVELOPMENT CO., LTD..

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in C4:F1:D1:00:00:00 that is C4:F1:D1 — 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 SOGOU TECHNOLOGY DEVELOPMENT CO., LTD. located?

BEIJING SOGOU TECHNOLOGY DEVELOPMENT CO., LTD. is listed at SOHU.COM INTERNET PLAZA, NO.1 PARK, ZHONGGUANCHUN EAST ROAD. HAIDIAN DISTRICT Beijing CN 100000 in the IEEE OUI registry entry for C4:F1:D1. This is the address the organization registered with the IEEE, which may differ from its current operating address.

BEIJING SOGOU TECHNOLOGY DEVELOPMENT CO., LTD.

MAC address prefix C4:F1:D1 is registered to BEIJING SOGOU TECHNOLOGY DEVELOPMENT CO., LTD. in the IEEE OUI registry. Any device whose MAC address begins with C4:F1:D1 has a network interface built by BEIJING SOGOU TECHNOLOGY DEVELOPMENT 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 C4:F1:D1:00:00:00 to C4:F1:D1:FF:FF:FF.

OUI prefix: C4:F1:D1
Hyphen form: C4-F1-D1
MAC range: C4:F1:D1:00:00:00 – C4:F1:D1:FF:FF:FF
Addresses in block: 16,777,216
Organization: BEIJING SOGOU TECHNOLOGY DEVELOPMENT CO., LTD.
Address: SOHU.COM INTERNET PLAZA, NO.1 PARK, ZHONGGUANCHUN EAST ROAD. HAIDIAN DISTRICT Beijing CN 100000
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.

2016-07-29Assigned to "BEIJING SOGOU TECHNOLOGY DEVELOPMENT CO., LTD."
archived source →
2026-07-17Assigned to "BEIJING SOGOU TECHNOLOGY DEVELOPMENT CO., LTD."

Nearby in the registry

The prefixes assigned immediately before and after C4:F1:D1:

FAQ

Which company owns MAC address prefix C4:F1:D1?: MAC address prefix C4:F1:D1 is registered to BEIJING SOGOU TECHNOLOGY DEVELOPMENT CO., LTD. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with C4:F1:D1 has a network interface built by BEIJING SOGOU TECHNOLOGY DEVELOPMENT CO., LTD..
What is the OUI C4:F1:D1?: C4:F1:D1 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to BEIJING SOGOU TECHNOLOGY DEVELOPMENT CO., LTD.. It covers every address from C4:F1:D1:00:00:00 to C4:F1:D1:FF:FF:FF, or 16,777,216 addresses in total. It is also written C4-F1-D1.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in C4:F1:D1:00:00:00 that is C4:F1:D1 — 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 SOGOU TECHNOLOGY DEVELOPMENT CO., LTD. located?: BEIJING SOGOU TECHNOLOGY DEVELOPMENT CO., LTD. is listed at SOHU.COM INTERNET PLAZA, NO.1 PARK, ZHONGGUANCHUN EAST ROAD. HAIDIAN DISTRICT Beijing CN 100000 in the IEEE OUI registry entry for C4:F1:D1. This is the address the organization registered with the IEEE, which may differ from its current operating address.