Which company owns MAC address prefix 1C:FF:3F?

MAC address prefix 1C:FF:3F is registered to Cust2mate in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 1C:FF:3F has a network interface built by Cust2mate.

What is the OUI 1C:FF:3F?

1C:FF:3F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Cust2mate. It covers every address from 1C:FF:3F:00:00:00 to 1C:FF:3F:FF:FF:FF, or 16,777,216 addresses in total. It is also written 1C-FF-3F.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 1C:FF:3F:00:00:00 that is 1C:FF:3F — 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 Cust2mate located?

Cust2mate is listed at 4 Ariel Sharon St Givatayim IL 5320047 in the IEEE OUI registry entry for 1C:FF:3F. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Cust2mate

MAC address prefix 1C:FF:3F is registered to Cust2mate in the IEEE OUI registry. Any device whose MAC address begins with 1C:FF:3F has a network interface built by Cust2mate. 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:FF:3F:00:00:00 to 1C:FF:3F:FF:FF:FF.

OUI prefix: 1C:FF:3F
Hyphen form: 1C-FF-3F
MAC range: 1C:FF:3F:00:00:00 – 1C:FF:3F:FF:FF:FF
Addresses in block: 16,777,216
Organization: Cust2mate
Address: 4 Ariel Sharon St Givatayim IL 5320047
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.

2026-01-08Assigned to "Cust2mate"
archived source →
2026-07-17Assigned to "Cust2mate"

Nearby in the registry

The prefixes assigned immediately before and after 1C:FF:3F:

FAQ

Which company owns MAC address prefix 1C:FF:3F?: MAC address prefix 1C:FF:3F is registered to Cust2mate in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 1C:FF:3F has a network interface built by Cust2mate.
What is the OUI 1C:FF:3F?: 1C:FF:3F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Cust2mate. It covers every address from 1C:FF:3F:00:00:00 to 1C:FF:3F:FF:FF:FF, or 16,777,216 addresses in total. It is also written 1C-FF-3F.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 1C:FF:3F:00:00:00 that is 1C:FF:3F — 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 Cust2mate located?: Cust2mate is listed at 4 Ariel Sharon St Givatayim IL 5320047 in the IEEE OUI registry entry for 1C:FF:3F. This is the address the organization registered with the IEEE, which may differ from its current operating address.