Which company owns MAC address prefix E4:47:91?

MAC address prefix E4:47:91 is registered to Iris ID Systems, Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with E4:47:91 has a network interface built by Iris ID Systems, Inc..

What is the OUI E4:47:91?

E4:47:91 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Iris ID Systems, Inc.. It covers every address from E4:47:91:00:00:00 to E4:47:91:FF:FF:FF, or 16,777,216 addresses in total. It is also written E4-47-91.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in E4:47:91:00:00:00 that is E4:47:91 — 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 Iris ID Systems, Inc. located?

Iris ID Systems, Inc. is listed at 8 Clarke Drive Cranbury US 08512 in the IEEE OUI registry entry for E4:47:91. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Iris ID Systems, Inc.

MAC address prefix E4:47:91 is registered to Iris ID Systems, Inc. in the IEEE OUI registry. Any device whose MAC address begins with E4:47:91 has a network interface built by Iris ID Systems, 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 E4:47:91:00:00:00 to E4:47:91:FF:FF:FF.

OUI prefix: E4:47:91
Hyphen form: E4-47-91
MAC range: E4:47:91:00:00:00 – E4:47:91:FF:FF:FF
Addresses in block: 16,777,216
Organization: Iris ID Systems, Inc.
Address: 8 Clarke Drive Cranbury US 08512
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.

2020-11-28Assigned to "Iris ID Systems, Inc."
archived source →
2026-07-17Assigned to "Iris ID Systems, Inc."

Nearby in the registry

The prefixes assigned immediately before and after E4:47:91:

FAQ

Which company owns MAC address prefix E4:47:91?: MAC address prefix E4:47:91 is registered to Iris ID Systems, Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with E4:47:91 has a network interface built by Iris ID Systems, Inc..
What is the OUI E4:47:91?: E4:47:91 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Iris ID Systems, Inc.. It covers every address from E4:47:91:00:00:00 to E4:47:91:FF:FF:FF, or 16,777,216 addresses in total. It is also written E4-47-91.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in E4:47:91:00:00:00 that is E4:47:91 — 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 Iris ID Systems, Inc. located?: Iris ID Systems, Inc. is listed at 8 Clarke Drive Cranbury US 08512 in the IEEE OUI registry entry for E4:47:91. This is the address the organization registered with the IEEE, which may differ from its current operating address.