Which company owns MAC address prefix 3C:45:0B?

MAC address prefix 3C:45:0B is registered to Sentry Equipment Corp. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 3C:45:0B has a network interface built by Sentry Equipment Corp..

What is the OUI 3C:45:0B?

3C:45:0B is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Sentry Equipment Corp.. It covers every address from 3C:45:0B:00:00:00 to 3C:45:0B:FF:FF:FF, or 16,777,216 addresses in total. It is also written 3C-45-0B.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 3C:45:0B:00:00:00 that is 3C:45:0B — 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 Sentry Equipment Corp. located?

Sentry Equipment Corp. is listed at 966 Blue Ribbon Cir N Oconomowoc WI US 53066 in the IEEE OUI registry entry for 3C:45:0B. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Sentry Equipment Corp.

MAC address prefix 3C:45:0B is registered to Sentry Equipment Corp. in the IEEE OUI registry. Any device whose MAC address begins with 3C:45:0B has a network interface built by Sentry Equipment Corp.. 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 3C:45:0B:00:00:00 to 3C:45:0B:FF:FF:FF.

OUI prefix: 3C:45:0B
Hyphen form: 3C-45-0B
MAC range: 3C:45:0B:00:00:00 – 3C:45:0B:FF:FF:FF
Addresses in block: 16,777,216
Organization: Sentry Equipment Corp.
Address: 966 Blue Ribbon Cir N Oconomowoc WI US 53066
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.

2024-02-15Assigned to "Sentry Equipment Corp."
archived source →
2026-07-17Assigned to "Sentry Equipment Corp."

Nearby in the registry

The prefixes assigned immediately before and after 3C:45:0B:

FAQ

Which company owns MAC address prefix 3C:45:0B?: MAC address prefix 3C:45:0B is registered to Sentry Equipment Corp. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 3C:45:0B has a network interface built by Sentry Equipment Corp..
What is the OUI 3C:45:0B?: 3C:45:0B is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Sentry Equipment Corp.. It covers every address from 3C:45:0B:00:00:00 to 3C:45:0B:FF:FF:FF, or 16,777,216 addresses in total. It is also written 3C-45-0B.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 3C:45:0B:00:00:00 that is 3C:45:0B — 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 Sentry Equipment Corp. located?: Sentry Equipment Corp. is listed at 966 Blue Ribbon Cir N Oconomowoc WI US 53066 in the IEEE OUI registry entry for 3C:45:0B. This is the address the organization registered with the IEEE, which may differ from its current operating address.