Which company owns MAC address prefix 28:7C:DB?

MAC address prefix 28:7C:DB is registered to Hefei Toycloud Technology Co.,ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 28:7C:DB has a network interface built by Hefei Toycloud Technology Co.,ltd.

What is the OUI 28:7C:DB?

28:7C:DB is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Hefei Toycloud Technology Co.,ltd. It covers every address from 28:7C:DB:00:00:00 to 28:7C:DB:FF:FF:FF, or 16,777,216 addresses in total. It is also written 28-7C-DB.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 28:7C:DB:00:00:00 that is 28:7C:DB — 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 Hefei Toycloud Technology Co.,ltd located?

Hefei Toycloud Technology Co.,ltd is listed at FLOOR 13,XUNFEI BUILDING,NO.666 WANGJIANG ROAD,HIGH & NEW TECHNOLOGY DEVELOPMENT ZONE.HEFEI. Hefei Anhui CN 230088 in the IEEE OUI registry entry for 28:7C:DB. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Hefei Toycloud Technology Co.,ltd

MAC address prefix 28:7C:DB is registered to Hefei Toycloud Technology Co.,ltd in the IEEE OUI registry. Any device whose MAC address begins with 28:7C:DB has a network interface built by Hefei Toycloud 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 28:7C:DB:00:00:00 to 28:7C:DB:FF:FF:FF.

OUI prefix: 28:7C:DB
Hyphen form: 28-7C-DB
MAC range: 28:7C:DB:00:00:00 – 28:7C:DB:FF:FF:FF
Addresses in block: 16,777,216
Organization: Hefei Toycloud Technology Co.,ltd
Address: FLOOR 13,XUNFEI BUILDING,NO.666 WANGJIANG ROAD,HIGH & NEW TECHNOLOGY DEVELOPMENT ZONE.HEFEI. Hefei Anhui CN 230088
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 "Hefei Toycloud Technology Co.,ltd"
archived source →
2026-07-17Assigned to "Hefei Toycloud Technology Co.,ltd"

Nearby in the registry

The prefixes assigned immediately before and after 28:7C:DB:

FAQ

Which company owns MAC address prefix 28:7C:DB?: MAC address prefix 28:7C:DB is registered to Hefei Toycloud Technology Co.,ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 28:7C:DB has a network interface built by Hefei Toycloud Technology Co.,ltd.
What is the OUI 28:7C:DB?: 28:7C:DB is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Hefei Toycloud Technology Co.,ltd. It covers every address from 28:7C:DB:00:00:00 to 28:7C:DB:FF:FF:FF, or 16,777,216 addresses in total. It is also written 28-7C-DB.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 28:7C:DB:00:00:00 that is 28:7C:DB — 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 Hefei Toycloud Technology Co.,ltd located?: Hefei Toycloud Technology Co.,ltd is listed at FLOOR 13,XUNFEI BUILDING,NO.666 WANGJIANG ROAD,HIGH & NEW TECHNOLOGY DEVELOPMENT ZONE.HEFEI. Hefei Anhui CN 230088 in the IEEE OUI registry entry for 28:7C:DB. This is the address the organization registered with the IEEE, which may differ from its current operating address.