Which company owns MAC address prefix 90:DF:46?

MAC address prefix 90:DF:46 is registered to Shanghai Tosun Technology Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 90:DF:46 has a network interface built by Shanghai Tosun Technology Ltd.

What is the OUI 90:DF:46?

90:DF:46 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Shanghai Tosun Technology Ltd. It covers every address from 90:DF:46:00:00:00 to 90:DF:46:FF:FF:FF, or 16,777,216 addresses in total. It is also written 90-DF-46.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 90:DF:46:00:00:00 that is 90:DF:46 — 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 Shanghai Tosun Technology Ltd located?

Shanghai Tosun Technology Ltd is listed at Room 207-1, No. 4801 Cao'an Road, Anting Town, Jiading District Shanghai Shanghai CN 201800 in the IEEE OUI registry entry for 90:DF:46. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Shanghai Tosun Technology Ltd

MAC address prefix 90:DF:46 is registered to Shanghai Tosun Technology Ltd in the IEEE OUI registry. Any device whose MAC address begins with 90:DF:46 has a network interface built by Shanghai Tosun Technology 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 90:DF:46:00:00:00 to 90:DF:46:FF:FF:FF.

OUI prefix: 90:DF:46
Hyphen form: 90-DF-46
MAC range: 90:DF:46:00:00:00 – 90:DF:46:FF:FF:FF
Addresses in block: 16,777,216
Organization: Shanghai Tosun Technology Ltd
Address: Room 207-1, No. 4801 Cao'an Road, Anting Town, Jiading District Shanghai Shanghai CN 201800
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 (1)

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

2026-09-03Assigned to "Shanghai Tosun Technology Ltd"

Nearby in the registry

The prefixes assigned immediately before and after 90:DF:46:

FAQ

Which company owns MAC address prefix 90:DF:46?: MAC address prefix 90:DF:46 is registered to Shanghai Tosun Technology Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 90:DF:46 has a network interface built by Shanghai Tosun Technology Ltd.
What is the OUI 90:DF:46?: 90:DF:46 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Shanghai Tosun Technology Ltd. It covers every address from 90:DF:46:00:00:00 to 90:DF:46:FF:FF:FF, or 16,777,216 addresses in total. It is also written 90-DF-46.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 90:DF:46:00:00:00 that is 90:DF:46 — 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 Shanghai Tosun Technology Ltd located?: Shanghai Tosun Technology Ltd is listed at Room 207-1, No. 4801 Cao'an Road, Anting Town, Jiading District Shanghai Shanghai CN 201800 in the IEEE OUI registry entry for 90:DF:46. This is the address the organization registered with the IEEE, which may differ from its current operating address.