Which company owns MAC address prefix 78:70:52?

MAC address prefix 78:70:52 is registered to Welotec GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 78:70:52 has a network interface built by Welotec GmbH.

What is the OUI 78:70:52?

78:70:52 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Welotec GmbH. It covers every address from 78:70:52:00:00:00 to 78:70:52:FF:FF:FF, or 16,777,216 addresses in total. It is also written 78-70-52.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 78:70:52:00:00:00 that is 78:70:52 — 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 Welotec GmbH located?

Welotec GmbH is listed at zum Hagenbach 7 Laer NRW DE 48366 in the IEEE OUI registry entry for 78:70:52. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Welotec GmbH

MAC address prefix 78:70:52 is registered to Welotec GmbH in the IEEE OUI registry. Any device whose MAC address begins with 78:70:52 has a network interface built by Welotec GmbH. 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 78:70:52:00:00:00 to 78:70:52:FF:FF:FF.

OUI prefix: 78:70:52
Hyphen form: 78-70-52
MAC range: 78:70:52:00:00:00 – 78:70:52:FF:FF:FF
Addresses in block: 16,777,216
Organization: Welotec GmbH
Address: zum Hagenbach 7 Laer NRW DE 48366
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.

2018-12-21Assigned to "Welotec GmbH"
archived source →
2026-07-17Assigned to "Welotec GmbH"

Nearby in the registry

The prefixes assigned immediately before and after 78:70:52:

FAQ

Which company owns MAC address prefix 78:70:52?: MAC address prefix 78:70:52 is registered to Welotec GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 78:70:52 has a network interface built by Welotec GmbH.
What is the OUI 78:70:52?: 78:70:52 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Welotec GmbH. It covers every address from 78:70:52:00:00:00 to 78:70:52:FF:FF:FF, or 16,777,216 addresses in total. It is also written 78-70-52.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 78:70:52:00:00:00 that is 78:70:52 — 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 Welotec GmbH located?: Welotec GmbH is listed at zum Hagenbach 7 Laer NRW DE 48366 in the IEEE OUI registry entry for 78:70:52. This is the address the organization registered with the IEEE, which may differ from its current operating address.