Which company owns MAC address prefix 28:39:E7?

MAC address prefix 28:39:E7 is registered to Preceno Technology Pte.Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 28:39:E7 has a network interface built by Preceno Technology Pte.Ltd..

What is the OUI 28:39:E7?

28:39:E7 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Preceno Technology Pte.Ltd.. It covers every address from 28:39:E7:00:00:00 to 28:39:E7:FF:FF:FF, or 16,777,216 addresses in total. It is also written 28-39-E7.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 28:39:E7:00:00:00 that is 28:39:E7 — 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 Preceno Technology Pte.Ltd. located?

Preceno Technology Pte.Ltd. is listed at 11F, No.207-2, Sec. 3, Beixin Rd., Xindian Dist. New Taipei City TW 23143 in the IEEE OUI registry entry for 28:39:E7. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Preceno Technology Pte.Ltd.

MAC address prefix 28:39:E7 is registered to Preceno Technology Pte.Ltd. in the IEEE OUI registry. Any device whose MAC address begins with 28:39:E7 has a network interface built by Preceno Technology Pte.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 28:39:E7:00:00:00 to 28:39:E7:FF:FF:FF.

OUI prefix: 28:39:E7
Hyphen form: 28-39-E7
MAC range: 28:39:E7:00:00:00 – 28:39:E7:FF:FF:FF
Addresses in block: 16,777,216
Organization: Preceno Technology Pte.Ltd.
Address: 11F, No.207-2, Sec. 3, Beixin Rd., Xindian Dist. New Taipei City TW 23143
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 "Preceno Technology Pte.Ltd."
archived source →
2026-07-17Assigned to "Preceno Technology Pte.Ltd."

Nearby in the registry

The prefixes assigned immediately before and after 28:39:E7:

FAQ

Which company owns MAC address prefix 28:39:E7?: MAC address prefix 28:39:E7 is registered to Preceno Technology Pte.Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 28:39:E7 has a network interface built by Preceno Technology Pte.Ltd..
What is the OUI 28:39:E7?: 28:39:E7 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Preceno Technology Pte.Ltd.. It covers every address from 28:39:E7:00:00:00 to 28:39:E7:FF:FF:FF, or 16,777,216 addresses in total. It is also written 28-39-E7.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 28:39:E7:00:00:00 that is 28:39:E7 — 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 Preceno Technology Pte.Ltd. located?: Preceno Technology Pte.Ltd. is listed at 11F, No.207-2, Sec. 3, Beixin Rd., Xindian Dist. New Taipei City TW 23143 in the IEEE OUI registry entry for 28:39:E7. This is the address the organization registered with the IEEE, which may differ from its current operating address.