Which company owns MAC address prefix 28:CD:1C?

MAC address prefix 28:CD:1C is registered to Espotel Oy in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 28:CD:1C has a network interface built by Espotel Oy.

What is the OUI 28:CD:1C?

28:CD:1C is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Espotel Oy. It covers every address from 28:CD:1C:00:00:00 to 28:CD:1C:FF:FF:FF, or 16,777,216 addresses in total. It is also written 28-CD-1C.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 28:CD:1C:00:00:00 that is 28:CD:1C — 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 Espotel Oy located?

Espotel Oy is listed at Kappelitie 6 Espoo Espoo FI FI-02200 in the IEEE OUI registry entry for 28:CD:1C. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Espotel Oy

MAC address prefix 28:CD:1C is registered to Espotel Oy in the IEEE OUI registry. Any device whose MAC address begins with 28:CD:1C has a network interface built by Espotel Oy. 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 28:CD:1C:00:00:00 to 28:CD:1C:FF:FF:FF.

OUI prefix: 28:CD:1C
Hyphen form: 28-CD-1C
MAC range: 28:CD:1C:00:00:00 – 28:CD:1C:FF:FF:FF
Addresses in block: 16,777,216
Organization: Espotel Oy
Address: Kappelitie 6 Espoo Espoo FI FI-02200
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 "Espotel Oy"
archived source →
2026-07-17Assigned to "Espotel Oy"

Nearby in the registry

The prefixes assigned immediately before and after 28:CD:1C:

FAQ

Which company owns MAC address prefix 28:CD:1C?: MAC address prefix 28:CD:1C is registered to Espotel Oy in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 28:CD:1C has a network interface built by Espotel Oy.
What is the OUI 28:CD:1C?: 28:CD:1C is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Espotel Oy. It covers every address from 28:CD:1C:00:00:00 to 28:CD:1C:FF:FF:FF, or 16,777,216 addresses in total. It is also written 28-CD-1C.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 28:CD:1C:00:00:00 that is 28:CD:1C — 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 Espotel Oy located?: Espotel Oy is listed at Kappelitie 6 Espoo Espoo FI FI-02200 in the IEEE OUI registry entry for 28:CD:1C. This is the address the organization registered with the IEEE, which may differ from its current operating address.