Which company owns MAC address prefix 2C:E8:71?

MAC address prefix 2C:E8:71 is registered to Alert Metalguard ApS in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 2C:E8:71 has a network interface built by Alert Metalguard ApS.

What is the OUI 2C:E8:71?

2C:E8:71 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Alert Metalguard ApS. It covers every address from 2C:E8:71:00:00:00 to 2C:E8:71:FF:FF:FF, or 16,777,216 addresses in total. It is also written 2C-E8-71.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 2C:E8:71:00:00:00 that is 2C:E8:71 — 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 Alert Metalguard ApS located?

Alert Metalguard ApS is listed at Vester Voldgade 104, st, th Copenhagen V DK 1552 in the IEEE OUI registry entry for 2C:E8:71. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Alert Metalguard ApS

MAC address prefix 2C:E8:71 is registered to Alert Metalguard ApS in the IEEE OUI registry. Any device whose MAC address begins with 2C:E8:71 has a network interface built by Alert Metalguard ApS. 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 2C:E8:71:00:00:00 to 2C:E8:71:FF:FF:FF.

OUI prefix: 2C:E8:71
Hyphen form: 2C-E8-71
MAC range: 2C:E8:71:00:00:00 – 2C:E8:71:FF:FF:FF
Addresses in block: 16,777,216
Organization: Alert Metalguard ApS
Address: Vester Voldgade 104, st, th Copenhagen V DK 1552
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 "Alert Metalguard ApS"
archived source →
2026-07-17Assigned to "Alert Metalguard ApS"

Nearby in the registry

The prefixes assigned immediately before and after 2C:E8:71:

FAQ

Which company owns MAC address prefix 2C:E8:71?: MAC address prefix 2C:E8:71 is registered to Alert Metalguard ApS in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 2C:E8:71 has a network interface built by Alert Metalguard ApS.
What is the OUI 2C:E8:71?: 2C:E8:71 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Alert Metalguard ApS. It covers every address from 2C:E8:71:00:00:00 to 2C:E8:71:FF:FF:FF, or 16,777,216 addresses in total. It is also written 2C-E8-71.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 2C:E8:71:00:00:00 that is 2C:E8:71 — 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 Alert Metalguard ApS located?: Alert Metalguard ApS is listed at Vester Voldgade 104, st, th Copenhagen V DK 1552 in the IEEE OUI registry entry for 2C:E8:71. This is the address the organization registered with the IEEE, which may differ from its current operating address.