Which company owns MAC address prefix 70:31:87?

MAC address prefix 70:31:87 is registered to ACX GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 70:31:87 has a network interface built by ACX GmbH.

What is the OUI 70:31:87?

70:31:87 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to ACX GmbH. It covers every address from 70:31:87:00:00:00 to 70:31:87:FF:FF:FF, or 16,777,216 addresses in total. It is also written 70-31-87.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 70:31:87:00:00:00 that is 70:31:87 — 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 ACX GmbH located?

ACX GmbH is listed at Äußere Zwickauer Straße 8 Zwickau DE 08064 in the IEEE OUI registry entry for 70:31:87. This is the address the organization registered with the IEEE, which may differ from its current operating address.

ACX GmbH

MAC address prefix 70:31:87 is registered to ACX GmbH in the IEEE OUI registry. Any device whose MAC address begins with 70:31:87 has a network interface built by ACX 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 70:31:87:00:00:00 to 70:31:87:FF:FF:FF.

OUI prefix: 70:31:87
Hyphen form: 70-31-87
MAC range: 70:31:87:00:00:00 – 70:31:87:FF:FF:FF
Addresses in block: 16,777,216
Organization: ACX GmbH
Address: Äußere Zwickauer Straße 8 Zwickau DE 08064
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.

2016-07-29Assigned to "ACX GmbH"
archived source →
2026-07-17Assigned to "ACX GmbH"

Nearby in the registry

The prefixes assigned immediately before and after 70:31:87:

FAQ

Which company owns MAC address prefix 70:31:87?: MAC address prefix 70:31:87 is registered to ACX GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 70:31:87 has a network interface built by ACX GmbH.
What is the OUI 70:31:87?: 70:31:87 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to ACX GmbH. It covers every address from 70:31:87:00:00:00 to 70:31:87:FF:FF:FF, or 16,777,216 addresses in total. It is also written 70-31-87.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 70:31:87:00:00:00 that is 70:31:87 — 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 ACX GmbH located?: ACX GmbH is listed at Äußere Zwickauer Straße 8 Zwickau DE 08064 in the IEEE OUI registry entry for 70:31:87. This is the address the organization registered with the IEEE, which may differ from its current operating address.