Which company owns MAC address prefix 00:18:D1?

MAC address prefix 00:18:D1 is registered to Siemens Home & Office Comm. Devices in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 00:18:D1 has a network interface built by Siemens Home & Office Comm. Devices.

What is the OUI 00:18:D1?

00:18:D1 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Siemens Home & Office Comm. Devices. It covers every address from 00:18:D1:00:00:00 to 00:18:D1:FF:FF:FF, or 16,777,216 addresses in total. It is also written 00-18-D1.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 00:18:D1:00:00:00 that is 00:18:D1 — 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 Siemens Home & Office Comm. Devices located?

Siemens Home & Office Comm. Devices is listed at 4849 Alpha Rd. Dallas Texas US 75244 in the IEEE OUI registry entry for 00:18:D1. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does Siemens Home & Office Comm. Devices own?

Siemens Home & Office Comm. Devices holds 3 OUI prefixes in the IEEE registry, of which 00:18:D1 is one. A device made by Siemens Home & Office Comm. Devices could carry a MAC address from any of them.

Siemens Home & Office Comm. Devices

MAC address prefix 00:18:D1 is registered to Siemens Home & Office Comm. Devices in the IEEE OUI registry. Any device whose MAC address begins with 00:18:D1 has a network interface built by Siemens Home & Office Comm. Devices. 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 00:18:D1:00:00:00 to 00:18:D1:FF:FF:FF.

OUI prefix: 00:18:D1
Hyphen form: 00-18-D1
MAC range: 00:18:D1:00:00:00 – 00:18:D1:FF:FF:FF
Addresses in block: 16,777,216
Organization: Siemens Home & Office Comm. Devices
Address: 4849 Alpha Rd. Dallas Texas US 75244
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 Siemens Home & Office Comm. Devices

Siemens Home & Office Comm. Devices holds 3 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

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 "Siemens Home & Office Comm. Devices"
archived source →
2026-07-17Assigned to "Siemens Home & Office Comm. Devices"

Nearby in the registry

The prefixes assigned immediately before and after 00:18:D1:

FAQ

Which company owns MAC address prefix 00:18:D1?: MAC address prefix 00:18:D1 is registered to Siemens Home & Office Comm. Devices in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 00:18:D1 has a network interface built by Siemens Home & Office Comm. Devices.
What is the OUI 00:18:D1?: 00:18:D1 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Siemens Home & Office Comm. Devices. It covers every address from 00:18:D1:00:00:00 to 00:18:D1:FF:FF:FF, or 16,777,216 addresses in total. It is also written 00-18-D1.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 00:18:D1:00:00:00 that is 00:18:D1 — 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 Siemens Home & Office Comm. Devices located?: Siemens Home & Office Comm. Devices is listed at 4849 Alpha Rd. Dallas Texas US 75244 in the IEEE OUI registry entry for 00:18:D1. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Siemens Home & Office Comm. Devices own?: Siemens Home & Office Comm. Devices holds 3 OUI prefixes in the IEEE registry, of which 00:18:D1 is one. A device made by Siemens Home & Office Comm. Devices could carry a MAC address from any of them.