Which company owns MAC address prefix 5C:FC:E1?

MAC address prefix 5C:FC:E1 is registered to Resideo in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 5C:FC:E1 has a network interface built by Resideo.

What is the OUI 5C:FC:E1?

5C:FC:E1 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Resideo. It covers every address from 5C:FC:E1:00:00:00 to 5C:FC:E1:FF:FF:FF, or 16,777,216 addresses in total. It is also written 5C-FC-E1.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 5C:FC:E1:00:00:00 that is 5C:FC:E1 — 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 Resideo located?

Resideo is listed at 2 Corporate Center Dr. Melville NY US 11747 in the IEEE OUI registry entry for 5C:FC:E1. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does Resideo own?

Resideo holds 5 OUI prefixes in the IEEE registry, of which 5C:FC:E1 is one. A device made by Resideo could carry a MAC address from any of them.

Resideo

MAC address prefix 5C:FC:E1 is registered to Resideo in the IEEE OUI registry. Any device whose MAC address begins with 5C:FC:E1 has a network interface built by Resideo. 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 5C:FC:E1:00:00:00 to 5C:FC:E1:FF:FF:FF.

OUI prefix: 5C:FC:E1
Hyphen form: 5C-FC-E1
MAC range: 5C:FC:E1:00:00:00 – 5C:FC:E1:FF:FF:FF
Addresses in block: 16,777,216
Organization: Resideo
Address: 2 Corporate Center Dr. Melville NY US 11747
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 Resideo

Resideo holds 5 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

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 "Resideo"
archived source →
2026-07-17Assigned to "Resideo"

Nearby in the registry

The prefixes assigned immediately before and after 5C:FC:E1:

FAQ

Which company owns MAC address prefix 5C:FC:E1?: MAC address prefix 5C:FC:E1 is registered to Resideo in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 5C:FC:E1 has a network interface built by Resideo.
What is the OUI 5C:FC:E1?: 5C:FC:E1 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Resideo. It covers every address from 5C:FC:E1:00:00:00 to 5C:FC:E1:FF:FF:FF, or 16,777,216 addresses in total. It is also written 5C-FC-E1.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 5C:FC:E1:00:00:00 that is 5C:FC:E1 — 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 Resideo located?: Resideo is listed at 2 Corporate Center Dr. Melville NY US 11747 in the IEEE OUI registry entry for 5C:FC:E1. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Resideo own?: Resideo holds 5 OUI prefixes in the IEEE registry, of which 5C:FC:E1 is one. A device made by Resideo could carry a MAC address from any of them.