Which company owns MAC address prefix B4:1C:AB?

MAC address prefix B4:1C:AB is registered to ICR, inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B4:1C:AB has a network interface built by ICR, inc..

What is the OUI B4:1C:AB?

B4:1C:AB is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to ICR, inc.. It covers every address from B4:1C:AB:00:00:00 to B4:1C:AB:FF:FF:FF, or 16,777,216 addresses in total. It is also written B4-1C-AB.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in B4:1C:AB:00:00:00 that is B4:1C:AB — 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 ICR, inc. located?

ICR, inc. is listed at 6200 S Main St Suite 200 Aurora CO US 80016 in the IEEE OUI registry entry for B4:1C:AB. This is the address the organization registered with the IEEE, which may differ from its current operating address.

ICR, inc.

MAC address prefix B4:1C:AB is registered to ICR, inc. in the IEEE OUI registry. Any device whose MAC address begins with B4:1C:AB has a network interface built by ICR, 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 B4:1C:AB:00:00:00 to B4:1C:AB:FF:FF:FF.

OUI prefix: B4:1C:AB
Hyphen form: B4-1C-AB
MAC range: B4:1C:AB:00:00:00 – B4:1C:AB:FF:FF:FF
Addresses in block: 16,777,216
Organization: ICR, inc.
Address: 6200 S Main St Suite 200 Aurora CO US 80016
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.

2021-06-10Assigned to "ICR, inc."
archived source →
2026-07-17Assigned to "ICR, inc."

Nearby in the registry

The prefixes assigned immediately before and after B4:1C:AB:

FAQ

Which company owns MAC address prefix B4:1C:AB?: MAC address prefix B4:1C:AB is registered to ICR, inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B4:1C:AB has a network interface built by ICR, inc..
What is the OUI B4:1C:AB?: B4:1C:AB is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to ICR, inc.. It covers every address from B4:1C:AB:00:00:00 to B4:1C:AB:FF:FF:FF, or 16,777,216 addresses in total. It is also written B4-1C-AB.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in B4:1C:AB:00:00:00 that is B4:1C:AB — 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 ICR, inc. located?: ICR, inc. is listed at 6200 S Main St Suite 200 Aurora CO US 80016 in the IEEE OUI registry entry for B4:1C:AB. This is the address the organization registered with the IEEE, which may differ from its current operating address.