Which company owns MAC address prefix 5C:55:78?

MAC address prefix 5C:55:78 is registered to iryx corp in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 5C:55:78 has a network interface built by iryx corp.

What is the OUI 5C:55:78?

5C:55:78 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to iryx corp. It covers every address from 5C:55:78:00:00:00 to 5C:55:78:FF:FF:FF, or 16,777,216 addresses in total. It is also written 5C-55-78.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 5C:55:78:00:00:00 that is 5C:55:78 — 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 iryx corp located?

iryx corp is listed at 14 Hughes Irvine CA US 92618 in the IEEE OUI registry entry for 5C:55:78. This is the address the organization registered with the IEEE, which may differ from its current operating address.

iryx corp

MAC address prefix 5C:55:78 is registered to iryx corp in the IEEE OUI registry. Any device whose MAC address begins with 5C:55:78 has a network interface built by iryx corp. 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 5C:55:78:00:00:00 to 5C:55:78:FF:FF:FF.

OUI prefix: 5C:55:78
Hyphen form: 5C-55-78
MAC range: 5C:55:78:00:00:00 – 5C:55:78:FF:FF:FF
Addresses in block: 16,777,216
Organization: iryx corp
Address: 14 Hughes Irvine CA US 92618
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.

2020-03-21Assigned to "iryx corp"
archived source →
2026-07-17Assigned to "iryx corp"

Nearby in the registry

The prefixes assigned immediately before and after 5C:55:78:

FAQ

Which company owns MAC address prefix 5C:55:78?: MAC address prefix 5C:55:78 is registered to iryx corp in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 5C:55:78 has a network interface built by iryx corp.
What is the OUI 5C:55:78?: 5C:55:78 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to iryx corp. It covers every address from 5C:55:78:00:00:00 to 5C:55:78:FF:FF:FF, or 16,777,216 addresses in total. It is also written 5C-55-78.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 5C:55:78:00:00:00 that is 5C:55:78 — 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 iryx corp located?: iryx corp is listed at 14 Hughes Irvine CA US 92618 in the IEEE OUI registry entry for 5C:55:78. This is the address the organization registered with the IEEE, which may differ from its current operating address.