Which company owns MAC address prefix 84:9D:C5?

MAC address prefix 84:9D:C5 is registered to Centera Photonics Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 84:9D:C5 has a network interface built by Centera Photonics Inc..

What is the OUI 84:9D:C5?

84:9D:C5 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Centera Photonics Inc.. It covers every address from 84:9D:C5:00:00:00 to 84:9D:C5:FF:FF:FF, or 16,777,216 addresses in total. It is also written 84-9D-C5.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 84:9D:C5:00:00:00 that is 84:9D:C5 — 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 Centera Photonics Inc. located?

Centera Photonics Inc. is listed at 3F, No 6-3 Dusing Rd. Hsinchu Taiwan TW 30078 in the IEEE OUI registry entry for 84:9D:C5. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Centera Photonics Inc.

MAC address prefix 84:9D:C5 is registered to Centera Photonics Inc. in the IEEE OUI registry. Any device whose MAC address begins with 84:9D:C5 has a network interface built by Centera Photonics Inc.. 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 84:9D:C5:00:00:00 to 84:9D:C5:FF:FF:FF.

OUI prefix: 84:9D:C5
Hyphen form: 84-9D-C5
MAC range: 84:9D:C5:00:00:00 – 84:9D:C5:FF:FF:FF
Addresses in block: 16,777,216
Organization: Centera Photonics Inc.
Address: 3F, No 6-3 Dusing Rd. Hsinchu Taiwan TW 30078
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 "Centera Photonics Inc."
archived source →
2026-07-17Assigned to "Centera Photonics Inc."

Nearby in the registry

The prefixes assigned immediately before and after 84:9D:C5:

FAQ

Which company owns MAC address prefix 84:9D:C5?: MAC address prefix 84:9D:C5 is registered to Centera Photonics Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 84:9D:C5 has a network interface built by Centera Photonics Inc..
What is the OUI 84:9D:C5?: 84:9D:C5 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Centera Photonics Inc.. It covers every address from 84:9D:C5:00:00:00 to 84:9D:C5:FF:FF:FF, or 16,777,216 addresses in total. It is also written 84-9D-C5.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 84:9D:C5:00:00:00 that is 84:9D:C5 — 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 Centera Photonics Inc. located?: Centera Photonics Inc. is listed at 3F, No 6-3 Dusing Rd. Hsinchu Taiwan TW 30078 in the IEEE OUI registry entry for 84:9D:C5. This is the address the organization registered with the IEEE, which may differ from its current operating address.