Which company owns MAC address prefix 78:DD:D9?

MAC address prefix 78:DD:D9 is registered to Guangzhou Shiyuan Electronics Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 78:DD:D9 has a network interface built by Guangzhou Shiyuan Electronics Co., Ltd..

What is the OUI 78:DD:D9?

78:DD:D9 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Guangzhou Shiyuan Electronics Co., Ltd.. It covers every address from 78:DD:D9:00:00:00 to 78:DD:D9:FF:FF:FF, or 16,777,216 addresses in total. It is also written 78-DD-D9.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 78:DD:D9:00:00:00 that is 78:DD:D9 — 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 Guangzhou Shiyuan Electronics Co., Ltd. located?

Guangzhou Shiyuan Electronics Co., Ltd. is listed at No.6, 4th Yunpu Road, Yunpu Industry District Guangzhou Guangdong CN 510530 in the IEEE OUI registry entry for 78:DD:D9. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does Guangzhou Shiyuan Electronics Co., Ltd. own?

Guangzhou Shiyuan Electronics Co., Ltd. holds 3 OUI prefixes in the IEEE registry, of which 78:DD:D9 is one. A device made by Guangzhou Shiyuan Electronics Co., Ltd. could carry a MAC address from any of them.

Guangzhou Shiyuan Electronics Co., Ltd.

MAC address prefix 78:DD:D9 is registered to Guangzhou Shiyuan Electronics Co., Ltd. in the IEEE OUI registry. Any device whose MAC address begins with 78:DD:D9 has a network interface built by Guangzhou Shiyuan 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 78:DD:D9:00:00:00 to 78:DD:D9:FF:FF:FF.

OUI prefix: 78:DD:D9
Hyphen form: 78-DD-D9
MAC range: 78:DD:D9:00:00:00 – 78:DD:D9:FF:FF:FF
Addresses in block: 16,777,216
Organization: Guangzhou Shiyuan Electronics Co., Ltd.
Address: No.6, 4th Yunpu Road, Yunpu Industry District Guangzhou Guangdong CN 510530
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 Guangzhou Shiyuan Electronics Co., Ltd.

Guangzhou Shiyuan Electronics Co., Ltd. holds 3 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.

2017-09-08Assigned to "Guangzhou Shiyuan Electronics Co., Ltd."
archived source →
2026-07-17Assigned to "Guangzhou Shiyuan Electronics Co., Ltd."

Nearby in the registry

The prefixes assigned immediately before and after 78:DD:D9:

FAQ

Which company owns MAC address prefix 78:DD:D9?: MAC address prefix 78:DD:D9 is registered to Guangzhou Shiyuan Electronics Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 78:DD:D9 has a network interface built by Guangzhou Shiyuan Electronics Co., Ltd..
What is the OUI 78:DD:D9?: 78:DD:D9 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Guangzhou Shiyuan Electronics Co., Ltd.. It covers every address from 78:DD:D9:00:00:00 to 78:DD:D9:FF:FF:FF, or 16,777,216 addresses in total. It is also written 78-DD-D9.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 78:DD:D9:00:00:00 that is 78:DD:D9 — 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 Guangzhou Shiyuan Electronics Co., Ltd. located?: Guangzhou Shiyuan Electronics Co., Ltd. is listed at No.6, 4th Yunpu Road, Yunpu Industry District Guangzhou Guangdong CN 510530 in the IEEE OUI registry entry for 78:DD:D9. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Guangzhou Shiyuan Electronics Co., Ltd. own?: Guangzhou Shiyuan Electronics Co., Ltd. holds 3 OUI prefixes in the IEEE registry, of which 78:DD:D9 is one. A device made by Guangzhou Shiyuan Electronics Co., Ltd. could carry a MAC address from any of them.