Which company owns MAC address prefix 1C:EF:03?

MAC address prefix 1C:EF:03 is registered to Guangzhou V-SOLUTION Electronic Technology Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 1C:EF:03 has a network interface built by Guangzhou V-SOLUTION Electronic Technology Co., Ltd..

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 1C:EF:03:00:00:00 that is 1C:EF:03 — 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.

How many MAC prefixes does Guangzhou V-SOLUTION Electronic Technology Co., Ltd. own?

Guangzhou V-SOLUTION Electronic Technology Co., Ltd. holds 4 OUI prefixes in the IEEE registry, of which 1C:EF:03 is one. A device made by Guangzhou V-SOLUTION Electronic Technology Co., Ltd. could carry a MAC address from any of them.

Guangzhou V-SOLUTION Electronic Technology Co., Ltd.

MAC address prefix 1C:EF:03 is registered to Guangzhou V-SOLUTION Electronic Technology Co., Ltd. in the IEEE OUI registry. Any device whose MAC address begins with 1C:EF:03 has a network interface built by Guangzhou V-SOLUTION Electronic 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 1C:EF:03:00:00:00 to 1C:EF:03:FF:FF:FF.

OUI prefix: 1C:EF:03
Hyphen form: 1C-EF-03
MAC range: 1C:EF:03:00:00:00 – 1C:EF:03:FF:FF:FF
Addresses in block: 16,777,216
Organization: Guangzhou V-SOLUTION Electronic Technology Co., Ltd.
Address: Room 601,Originality Building B2, NO.162 Science Avenue,Science Town Guangzhou Guangdong CN 510663
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 V-SOLUTION Electronic Technology Co., Ltd.

Guangzhou V-SOLUTION Electronic Technology Co., 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.

2022-07-11Assigned to "Guangzhou V-SOLUTION Electronic Technology Co., Ltd."
archived source →
2026-07-17Assigned to "Guangzhou V-SOLUTION Electronic Technology Co., Ltd."

Nearby in the registry

The prefixes assigned immediately before and after 1C:EF:03:

FAQ

Which company owns MAC address prefix 1C:EF:03?: MAC address prefix 1C:EF:03 is registered to Guangzhou V-SOLUTION Electronic Technology Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 1C:EF:03 has a network interface built by Guangzhou V-SOLUTION Electronic Technology Co., Ltd..
What is the OUI 1C:EF:03?: 1C:EF:03 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Guangzhou V-SOLUTION Electronic Technology Co., Ltd.. It covers every address from 1C:EF:03:00:00:00 to 1C:EF:03:FF:FF:FF, or 16,777,216 addresses in total. It is also written 1C-EF-03.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 1C:EF:03:00:00:00 that is 1C:EF:03 — 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 V-SOLUTION Electronic Technology Co., Ltd. located?: Guangzhou V-SOLUTION Electronic Technology Co., Ltd. is listed at Room 601,Originality Building B2, NO.162 Science Avenue,Science Town Guangzhou Guangdong CN 510663 in the IEEE OUI registry entry for 1C:EF:03. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Guangzhou V-SOLUTION Electronic Technology Co., Ltd. own?: Guangzhou V-SOLUTION Electronic Technology Co., Ltd. holds 4 OUI prefixes in the IEEE registry, of which 1C:EF:03 is one. A device made by Guangzhou V-SOLUTION Electronic Technology Co., Ltd. could carry a MAC address from any of them.