Which company owns MAC address prefix 44:C3:06?

MAC address prefix 44:C3:06 is registered to SIFROM Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 44:C3:06 has a network interface built by SIFROM Inc..

What is the OUI 44:C3:06?

44:C3:06 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to SIFROM Inc.. It covers every address from 44:C3:06:00:00:00 to 44:C3:06:FF:FF:FF, or 16,777,216 addresses in total. It is also written 44-C3-06.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 44:C3:06:00:00:00 that is 44:C3:06 — 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 SIFROM Inc. located?

SIFROM Inc. is listed at 1201 N. Orange St., Ste 700 #7112 Wilmington DE US 19801-1186 in the IEEE OUI registry entry for 44:C3:06. This is the address the organization registered with the IEEE, which may differ from its current operating address.

SIFROM Inc.

MAC address prefix 44:C3:06 is registered to SIFROM Inc. in the IEEE OUI registry. Any device whose MAC address begins with 44:C3:06 has a network interface built by SIFROM 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 44:C3:06:00:00:00 to 44:C3:06:FF:FF:FF.

OUI prefix: 44:C3:06
Hyphen form: 44-C3-06
MAC range: 44:C3:06:00:00:00 – 44:C3:06:FF:FF:FF
Addresses in block: 16,777,216
Organization: SIFROM Inc.
Address: 1201 N. Orange St., Ste 700 #7112 Wilmington DE US 19801-1186
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.

2016-07-29Assigned to "SIFROM Inc."
archived source →
2026-07-17Assigned to "SIFROM Inc."

Nearby in the registry

The prefixes assigned immediately before and after 44:C3:06:

FAQ

Which company owns MAC address prefix 44:C3:06?: MAC address prefix 44:C3:06 is registered to SIFROM Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 44:C3:06 has a network interface built by SIFROM Inc..
What is the OUI 44:C3:06?: 44:C3:06 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to SIFROM Inc.. It covers every address from 44:C3:06:00:00:00 to 44:C3:06:FF:FF:FF, or 16,777,216 addresses in total. It is also written 44-C3-06.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 44:C3:06:00:00:00 that is 44:C3:06 — 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 SIFROM Inc. located?: SIFROM Inc. is listed at 1201 N. Orange St., Ste 700 #7112 Wilmington DE US 19801-1186 in the IEEE OUI registry entry for 44:C3:06. This is the address the organization registered with the IEEE, which may differ from its current operating address.