Which company owns MAC address prefix 9C:40:CD?

MAC address prefix 9C:40:CD is registered to Synclayer Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 9C:40:CD has a network interface built by Synclayer Inc..

What is the OUI 9C:40:CD?

9C:40:CD is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Synclayer Inc.. It covers every address from 9C:40:CD:00:00:00 to 9C:40:CD:FF:FF:FF, or 16,777,216 addresses in total. It is also written 9C-40-CD.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 9C:40:CD:00:00:00 that is 9C:40:CD — 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 Synclayer Inc. located?

Synclayer Inc. is listed at 1-20 Himegaoka Kani Gifu JP 5090249 in the IEEE OUI registry entry for 9C:40:CD. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does Synclayer Inc. own?

Synclayer Inc. holds 2 OUI prefixes in the IEEE registry, of which 9C:40:CD is one. A device made by Synclayer Inc. could carry a MAC address from any of them.

Synclayer Inc.

MAC address prefix 9C:40:CD is registered to Synclayer Inc. in the IEEE OUI registry. Any device whose MAC address begins with 9C:40:CD has a network interface built by Synclayer 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:40:CD:00:00:00 to 9C:40:CD:FF:FF:FF.

OUI prefix: 9C:40:CD
Hyphen form: 9C-40-CD
MAC range: 9C:40:CD:00:00:00 – 9C:40:CD:FF:FF:FF
Addresses in block: 16,777,216
Organization: Synclayer Inc.
Address: 1-20 Himegaoka Kani Gifu JP 5090249
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 Synclayer Inc.

Synclayer Inc. holds 2 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

00:60:6B

Assignment history (1)

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

2026-07-17Assigned to "Synclayer Inc."

Nearby in the registry

The prefixes assigned immediately before and after 9C:40:CD:

FAQ

Which company owns MAC address prefix 9C:40:CD?: MAC address prefix 9C:40:CD is registered to Synclayer Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 9C:40:CD has a network interface built by Synclayer Inc..
What is the OUI 9C:40:CD?: 9C:40:CD is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Synclayer Inc.. It covers every address from 9C:40:CD:00:00:00 to 9C:40:CD:FF:FF:FF, or 16,777,216 addresses in total. It is also written 9C-40-CD.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 9C:40:CD:00:00:00 that is 9C:40:CD — 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 Synclayer Inc. located?: Synclayer Inc. is listed at 1-20 Himegaoka Kani Gifu JP 5090249 in the IEEE OUI registry entry for 9C:40:CD. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Synclayer Inc. own?: Synclayer Inc. holds 2 OUI prefixes in the IEEE registry, of which 9C:40:CD is one. A device made by Synclayer Inc. could carry a MAC address from any of them.