Which company owns MAC address prefix 9C:FF:BE?

MAC address prefix 9C:FF:BE is registered to OTSL Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 9C:FF:BE has a network interface built by OTSL Inc..

What is the OUI 9C:FF:BE?

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

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 9C:FF:BE:00:00:00 that is 9C:FF:BE — 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 OTSL Inc. located?

OTSL Inc. is listed at HANROKU Bldg. 2F, 2-1-2 Shinjuku-ku Tokyo JP 160-0021 in the IEEE OUI registry entry for 9C:FF:BE. This is the address the organization registered with the IEEE, which may differ from its current operating address.

OTSL Inc.

MAC address prefix 9C:FF:BE is registered to OTSL Inc. in the IEEE OUI registry. Any device whose MAC address begins with 9C:FF:BE has a network interface built by OTSL 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 9C:FF:BE:00:00:00 to 9C:FF:BE:FF:FF:FF.

OUI prefix: 9C:FF:BE
Hyphen form: 9C-FF-BE
MAC range: 9C:FF:BE:00:00:00 – 9C:FF:BE:FF:FF:FF
Addresses in block: 16,777,216
Organization: OTSL Inc.
Address: HANROKU Bldg. 2F, 2-1-2 Shinjuku-ku Tokyo JP 160-0021
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 "OTSL Inc."
archived source →
2026-07-17Assigned to "OTSL Inc."

Nearby in the registry

The prefixes assigned immediately before and after 9C:FF:BE:

FAQ

Which company owns MAC address prefix 9C:FF:BE?: MAC address prefix 9C:FF:BE is registered to OTSL Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 9C:FF:BE has a network interface built by OTSL Inc..
What is the OUI 9C:FF:BE?: 9C:FF:BE is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to OTSL Inc.. It covers every address from 9C:FF:BE:00:00:00 to 9C:FF:BE:FF:FF:FF, or 16,777,216 addresses in total. It is also written 9C-FF-BE.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 9C:FF:BE:00:00:00 that is 9C:FF:BE — 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 OTSL Inc. located?: OTSL Inc. is listed at HANROKU Bldg. 2F, 2-1-2 Shinjuku-ku Tokyo JP 160-0021 in the IEEE OUI registry entry for 9C:FF:BE. This is the address the organization registered with the IEEE, which may differ from its current operating address.