Which company owns MAC address prefix 40:1B:5F?

MAC address prefix 40:1B:5F is registered to WEIFANG GOERTEK ELECTRONICS CO.,LTD in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 40:1B:5F has a network interface built by WEIFANG GOERTEK ELECTRONICS CO.,LTD.

What is the OUI 40:1B:5F?

40:1B:5F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to WEIFANG GOERTEK ELECTRONICS CO.,LTD. It covers every address from 40:1B:5F:00:00:00 to 40:1B:5F:FF:FF:FF, or 16,777,216 addresses in total. It is also written 40-1B-5F.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 40:1B:5F:00:00:00 that is 40:1B:5F — 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 WEIFANG GOERTEK ELECTRONICS CO.,LTD located?

WEIFANG GOERTEK ELECTRONICS CO.,LTD is listed at Gaoxin 2 Road,Free Trade Zone,Weifang,Shandong,261205,P.R.China Weifang Shandong CN 261205 in the IEEE OUI registry entry for 40:1B:5F. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does WEIFANG GOERTEK ELECTRONICS CO.,LTD own?

WEIFANG GOERTEK ELECTRONICS CO.,LTD holds 20 OUI prefixes in the IEEE registry, of which 40:1B:5F is one. A device made by WEIFANG GOERTEK ELECTRONICS CO.,LTD could carry a MAC address from any of them.

WEIFANG GOERTEK ELECTRONICS CO.,LTD

MAC address prefix 40:1B:5F is registered to WEIFANG GOERTEK ELECTRONICS CO.,LTD in the IEEE OUI registry. Any device whose MAC address begins with 40:1B:5F has a network interface built by WEIFANG GOERTEK ELECTRONICS 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 40:1B:5F:00:00:00 to 40:1B:5F:FF:FF:FF.

OUI prefix: 40:1B:5F
Hyphen form: 40-1B-5F
MAC range: 40:1B:5F:00:00:00 – 40:1B:5F:FF:FF:FF
Addresses in block: 16,777,216
Organization: WEIFANG GOERTEK ELECTRONICS CO.,LTD
Address: Gaoxin 2 Road,Free Trade Zone,Weifang,Shandong,261205,P.R.China Weifang Shandong CN 261205
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 WEIFANG GOERTEK ELECTRONICS CO.,LTD

WEIFANG GOERTEK ELECTRONICS CO.,LTD holds 20 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

Assignment history (4)

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 "Weifang GoerTek Electronics Co., Ltd."
archived source →
2017-09-08Renamed from "Weifang GoerTek Electronics Co., Ltd." to "Weifang GoerTek Technology Co.,Ltd."
archived source →
2018-12-21Renamed from "Weifang GoerTek Technology Co.,Ltd." to "WEIFANG GOERTEK ELECTRONICS CO.,LTD"
archived source →
2026-07-17Assigned to "WEIFANG GOERTEK ELECTRONICS CO.,LTD"

Nearby in the registry

The prefixes assigned immediately before and after 40:1B:5F:

FAQ

Which company owns MAC address prefix 40:1B:5F?: MAC address prefix 40:1B:5F is registered to WEIFANG GOERTEK ELECTRONICS CO.,LTD in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 40:1B:5F has a network interface built by WEIFANG GOERTEK ELECTRONICS CO.,LTD.
What is the OUI 40:1B:5F?: 40:1B:5F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to WEIFANG GOERTEK ELECTRONICS CO.,LTD. It covers every address from 40:1B:5F:00:00:00 to 40:1B:5F:FF:FF:FF, or 16,777,216 addresses in total. It is also written 40-1B-5F.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 40:1B:5F:00:00:00 that is 40:1B:5F — 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 WEIFANG GOERTEK ELECTRONICS CO.,LTD located?: WEIFANG GOERTEK ELECTRONICS CO.,LTD is listed at Gaoxin 2 Road,Free Trade Zone,Weifang,Shandong,261205,P.R.China Weifang Shandong CN 261205 in the IEEE OUI registry entry for 40:1B:5F. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does WEIFANG GOERTEK ELECTRONICS CO.,LTD own?: WEIFANG GOERTEK ELECTRONICS CO.,LTD holds 20 OUI prefixes in the IEEE registry, of which 40:1B:5F is one. A device made by WEIFANG GOERTEK ELECTRONICS CO.,LTD could carry a MAC address from any of them.