Which company owns MAC address prefix 44:27:F3?

MAC address prefix 44:27:F3 is registered to 70mai Co.,Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 44:27:F3 has a network interface built by 70mai Co.,Ltd..

What is the OUI 44:27:F3?

44:27:F3 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to 70mai Co.,Ltd.. It covers every address from 44:27:F3:00:00:00 to 44:27:F3:FF:FF:FF, or 16,777,216 addresses in total. It is also written 44-27-F3.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 44:27:F3:00:00:00 that is 44:27:F3 — 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 70mai Co.,Ltd. located?

70mai Co.,Ltd. is listed at Room 2220, building 2, No. 588, Zixing road Shanghai MinHang District CN 201100 in the IEEE OUI registry entry for 44:27:F3. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does 70mai Co.,Ltd. own?

70mai Co.,Ltd. holds 2 OUI prefixes in the IEEE registry, of which 44:27:F3 is one. A device made by 70mai Co.,Ltd. could carry a MAC address from any of them.

70mai Co.,Ltd.

MAC address prefix 44:27:F3 is registered to 70mai Co.,Ltd. in the IEEE OUI registry. Any device whose MAC address begins with 44:27:F3 has a network interface built by 70mai 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 44:27:F3:00:00:00 to 44:27:F3:FF:FF:FF.

OUI prefix: 44:27:F3
Hyphen form: 44-27-F3
MAC range: 44:27:F3:00:00:00 – 44:27:F3:FF:FF:FF
Addresses in block: 16,777,216
Organization: 70mai Co.,Ltd.
Address: Room 2220, building 2, No. 588, Zixing road Shanghai MinHang District CN 201100
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 70mai Co.,Ltd.

70mai Co.,Ltd. holds 2 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

B8:59:C8

Assignment history (2)

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

2020-08-05Assigned to "70mai Co.,Ltd."
archived source →
2026-07-17Assigned to "70mai Co.,Ltd."

Nearby in the registry

The prefixes assigned immediately before and after 44:27:F3:

FAQ

Which company owns MAC address prefix 44:27:F3?: MAC address prefix 44:27:F3 is registered to 70mai Co.,Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 44:27:F3 has a network interface built by 70mai Co.,Ltd..
What is the OUI 44:27:F3?: 44:27:F3 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to 70mai Co.,Ltd.. It covers every address from 44:27:F3:00:00:00 to 44:27:F3:FF:FF:FF, or 16,777,216 addresses in total. It is also written 44-27-F3.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 44:27:F3:00:00:00 that is 44:27:F3 — 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 70mai Co.,Ltd. located?: 70mai Co.,Ltd. is listed at Room 2220, building 2, No. 588, Zixing road Shanghai MinHang District CN 201100 in the IEEE OUI registry entry for 44:27:F3. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does 70mai Co.,Ltd. own?: 70mai Co.,Ltd. holds 2 OUI prefixes in the IEEE registry, of which 44:27:F3 is one. A device made by 70mai Co.,Ltd. could carry a MAC address from any of them.