Which company owns MAC address prefix 00:A0:45?

MAC address prefix 00:A0:45 is registered to Phoenix Contact GmbH & Co. KG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 00:A0:45 has a network interface built by Phoenix Contact GmbH & Co. KG.

What is the OUI 00:A0:45?

00:A0:45 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Phoenix Contact GmbH & Co. KG. It covers every address from 00:A0:45:00:00:00 to 00:A0:45:FF:FF:FF, or 16,777,216 addresses in total. It is also written 00-A0-45.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 00:A0:45:00:00:00 that is 00:A0:45 — 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 Phoenix Contact GmbH & Co. KG located?

Phoenix Contact GmbH & Co. KG is listed at POSTFACH 1341 lower saxony DE D-31812 in the IEEE OUI registry entry for 00:A0:45. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does Phoenix Contact GmbH & Co. KG own?

Phoenix Contact GmbH & Co. KG holds 3 OUI prefixes in the IEEE registry, of which 00:A0:45 is one. A device made by Phoenix Contact GmbH & Co. KG could carry a MAC address from any of them.

Phoenix Contact GmbH & Co. KG

MAC address prefix 00:A0:45 is registered to Phoenix Contact GmbH & Co. KG in the IEEE OUI registry. Any device whose MAC address begins with 00:A0:45 has a network interface built by Phoenix Contact GmbH & Co. KG. 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 00:A0:45:00:00:00 to 00:A0:45:FF:FF:FF.

OUI prefix: 00:A0:45
Hyphen form: 00-A0-45
MAC range: 00:A0:45:00:00:00 – 00:A0:45:FF:FF:FF
Addresses in block: 16,777,216
Organization: Phoenix Contact GmbH & Co. KG
Address: POSTFACH 1341 lower saxony DE D-31812
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.

Other prefixes from Phoenix Contact GmbH & Co. KG

Phoenix Contact GmbH & Co. KG holds 3 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

Assignment history (3)

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 "PHOENIX CONTACT Electronics GmbH"
archived source →
2024-11-20Renamed from "PHOENIX CONTACT Electronics GmbH" to "Phoenix Contact GmbH & Co. KG"
archived source →
2026-07-17Assigned to "Phoenix Contact GmbH & Co. KG"

Nearby in the registry

The prefixes assigned immediately before and after 00:A0:45:

FAQ

Which company owns MAC address prefix 00:A0:45?: MAC address prefix 00:A0:45 is registered to Phoenix Contact GmbH & Co. KG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 00:A0:45 has a network interface built by Phoenix Contact GmbH & Co. KG.
What is the OUI 00:A0:45?: 00:A0:45 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Phoenix Contact GmbH & Co. KG. It covers every address from 00:A0:45:00:00:00 to 00:A0:45:FF:FF:FF, or 16,777,216 addresses in total. It is also written 00-A0-45.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 00:A0:45:00:00:00 that is 00:A0:45 — 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 Phoenix Contact GmbH & Co. KG located?: Phoenix Contact GmbH & Co. KG is listed at POSTFACH 1341 lower saxony DE D-31812 in the IEEE OUI registry entry for 00:A0:45. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Phoenix Contact GmbH & Co. KG own?: Phoenix Contact GmbH & Co. KG holds 3 OUI prefixes in the IEEE registry, of which 00:A0:45 is one. A device made by Phoenix Contact GmbH & Co. KG could carry a MAC address from any of them.