Which company owns MAC address prefix BC:99:BC?

MAC address prefix BC:99:BC is registered to FonSee Technology Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with BC:99:BC has a network interface built by FonSee Technology Inc..

What is the OUI BC:99:BC?

BC:99:BC is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to FonSee Technology Inc.. It covers every address from BC:99:BC:00:00:00 to BC:99:BC:FF:FF:FF, or 16,777,216 addresses in total. It is also written BC-99-BC.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in BC:99:BC:00:00:00 that is BC:99:BC — 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 FonSee Technology Inc. located?

FonSee Technology Inc. is listed at 14F-2, No.32, Gaotie 2nd Rd., Zhubei City Hsinchu County TW 302 in the IEEE OUI registry entry for BC:99:BC. This is the address the organization registered with the IEEE, which may differ from its current operating address.

FonSee Technology Inc.

MAC address prefix BC:99:BC is registered to FonSee Technology Inc. in the IEEE OUI registry. Any device whose MAC address begins with BC:99:BC has a network interface built by FonSee Technology 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 BC:99:BC:00:00:00 to BC:99:BC:FF:FF:FF.

OUI prefix: BC:99:BC
Hyphen form: BC-99-BC
MAC range: BC:99:BC:00:00:00 – BC:99:BC:FF:FF:FF
Addresses in block: 16,777,216
Organization: FonSee Technology Inc.
Address: 14F-2, No.32, Gaotie 2nd Rd., Zhubei City Hsinchu County TW 302
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 "FonSee Technology Inc."
archived source →
2026-07-17Assigned to "FonSee Technology Inc."

Nearby in the registry

The prefixes assigned immediately before and after BC:99:BC:

FAQ

Which company owns MAC address prefix BC:99:BC?: MAC address prefix BC:99:BC is registered to FonSee Technology Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with BC:99:BC has a network interface built by FonSee Technology Inc..
What is the OUI BC:99:BC?: BC:99:BC is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to FonSee Technology Inc.. It covers every address from BC:99:BC:00:00:00 to BC:99:BC:FF:FF:FF, or 16,777,216 addresses in total. It is also written BC-99-BC.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in BC:99:BC:00:00:00 that is BC:99:BC — 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 FonSee Technology Inc. located?: FonSee Technology Inc. is listed at 14F-2, No.32, Gaotie 2nd Rd., Zhubei City Hsinchu County TW 302 in the IEEE OUI registry entry for BC:99:BC. This is the address the organization registered with the IEEE, which may differ from its current operating address.