Which company owns MAC address prefix 40:7A:A4?

MAC address prefix 40:7A:A4 is registered to ZHEJIANG DAHUA TECHNOLOGYCO.,LTD in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 40:7A:A4 has a network interface built by ZHEJIANG DAHUA TECHNOLOGYCO.,LTD.

What is the OUI 40:7A:A4?

40:7A:A4 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to ZHEJIANG DAHUA TECHNOLOGYCO.,LTD. It covers every address from 40:7A:A4:00:00:00 to 40:7A:A4:FF:FF:FF, or 16,777,216 addresses in total. It is also written 40-7A-A4.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 40:7A:A4:00:00:00 that is 40:7A: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 ZHEJIANG DAHUA TECHNOLOGYCO.,LTD located?

ZHEJIANG DAHUA TECHNOLOGYCO.,LTD is listed at 1st Floor, Building 1, No. 1399, Binxing Road, Changhe Street, Binjiang District Hangzhou City Zhejiang Province CN 311200 in the IEEE OUI registry entry for 40:7A:A4. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does ZHEJIANG DAHUA TECHNOLOGYCO.,LTD own?

ZHEJIANG DAHUA TECHNOLOGYCO.,LTD holds 4 OUI prefixes in the IEEE registry, of which 40:7A:A4 is one. A device made by ZHEJIANG DAHUA TECHNOLOGYCO.,LTD could carry a MAC address from any of them.

ZHEJIANG DAHUA TECHNOLOGYCO.,LTD

MAC address prefix 40:7A:A4 is registered to ZHEJIANG DAHUA TECHNOLOGYCO.,LTD in the IEEE OUI registry. Any device whose MAC address begins with 40:7A:A4 has a network interface built by ZHEJIANG DAHUA TECHNOLOGYCO.,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 40:7A:A4:00:00:00 to 40:7A:A4:FF:FF:FF.

OUI prefix: 40:7A:A4
Hyphen form: 40-7A-A4
MAC range: 40:7A:A4:00:00:00 – 40:7A:A4:FF:FF:FF
Addresses in block: 16,777,216
Organization: ZHEJIANG DAHUA TECHNOLOGYCO.,LTD
Address: 1st Floor, Building 1, No. 1399, Binxing Road, Changhe Street, Binjiang District Hangzhou City Zhejiang Province CN 311200
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 ZHEJIANG DAHUA TECHNOLOGYCO.,LTD

ZHEJIANG DAHUA TECHNOLOGYCO.,LTD holds 4 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

Assignment history (2)

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

2025-05-13Assigned to "ZHEJIANG DAHUA TECHNOLOGYCO.,LTD"
archived source →
2026-07-17Assigned to "ZHEJIANG DAHUA TECHNOLOGYCO.,LTD"

Nearby in the registry

The prefixes assigned immediately before and after 40:7A:A4:

FAQ

Which company owns MAC address prefix 40:7A:A4?: MAC address prefix 40:7A:A4 is registered to ZHEJIANG DAHUA TECHNOLOGYCO.,LTD in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 40:7A:A4 has a network interface built by ZHEJIANG DAHUA TECHNOLOGYCO.,LTD.
What is the OUI 40:7A:A4?: 40:7A:A4 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to ZHEJIANG DAHUA TECHNOLOGYCO.,LTD. It covers every address from 40:7A:A4:00:00:00 to 40:7A:A4:FF:FF:FF, or 16,777,216 addresses in total. It is also written 40-7A-A4.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 40:7A:A4:00:00:00 that is 40:7A: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 ZHEJIANG DAHUA TECHNOLOGYCO.,LTD located?: ZHEJIANG DAHUA TECHNOLOGYCO.,LTD is listed at 1st Floor, Building 1, No. 1399, Binxing Road, Changhe Street, Binjiang District Hangzhou City Zhejiang Province CN 311200 in the IEEE OUI registry entry for 40:7A:A4. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does ZHEJIANG DAHUA TECHNOLOGYCO.,LTD own?: ZHEJIANG DAHUA TECHNOLOGYCO.,LTD holds 4 OUI prefixes in the IEEE registry, of which 40:7A:A4 is one. A device made by ZHEJIANG DAHUA TECHNOLOGYCO.,LTD could carry a MAC address from any of them.