Which company owns MAC address prefix 1C:73:28?

MAC address prefix 1C:73:28 is registered to Connected Home in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 1C:73:28 has a network interface built by Connected Home.

What is the OUI 1C:73:28?

1C:73:28 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Connected Home. It covers every address from 1C:73:28:00:00:00 to 1C:73:28:FF:FF:FF, or 16,777,216 addresses in total. It is also written 1C-73-28.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 1C:73:28:00:00:00 that is 1C:73:28 — 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 Connected Home located?

Connected Home is listed at 19-22, Rathbone Place London GB W1T 1HY in the IEEE OUI registry entry for 1C:73:28. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does Connected Home own?

Connected Home holds 2 OUI prefixes in the IEEE registry, of which 1C:73:28 is one. A device made by Connected Home could carry a MAC address from any of them.

Connected Home

MAC address prefix 1C:73:28 is registered to Connected Home in the IEEE OUI registry. Any device whose MAC address begins with 1C:73:28 has a network interface built by Connected Home. 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 1C:73:28:00:00:00 to 1C:73:28:FF:FF:FF.

OUI prefix: 1C:73:28
Hyphen form: 1C-73-28
MAC range: 1C:73:28:00:00:00 – 1C:73:28:FF:FF:FF
Addresses in block: 16,777,216
Organization: Connected Home
Address: 19-22, Rathbone Place London GB W1T 1HY
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 Connected Home

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

44:7F:77

Assignment history (2)

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

2017-09-08Assigned to "Connected Home"
archived source →
2026-07-17Assigned to "Connected Home"

Nearby in the registry

The prefixes assigned immediately before and after 1C:73:28:

FAQ

Which company owns MAC address prefix 1C:73:28?: MAC address prefix 1C:73:28 is registered to Connected Home in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 1C:73:28 has a network interface built by Connected Home.
What is the OUI 1C:73:28?: 1C:73:28 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Connected Home. It covers every address from 1C:73:28:00:00:00 to 1C:73:28:FF:FF:FF, or 16,777,216 addresses in total. It is also written 1C-73-28.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 1C:73:28:00:00:00 that is 1C:73:28 — 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 Connected Home located?: Connected Home is listed at 19-22, Rathbone Place London GB W1T 1HY in the IEEE OUI registry entry for 1C:73:28. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Connected Home own?: Connected Home holds 2 OUI prefixes in the IEEE registry, of which 1C:73:28 is one. A device made by Connected Home could carry a MAC address from any of them.