Which company owns MAC address prefix D8:D2:7C?

MAC address prefix D8:D2:7C is registered to JEMA ENERGY, SA in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with D8:D2:7C has a network interface built by JEMA ENERGY, SA.

What is the OUI D8:D2:7C?

D8:D2:7C is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to JEMA ENERGY, SA. It covers every address from D8:D2:7C:00:00:00 to D8:D2:7C:FF:FF:FF, or 16,777,216 addresses in total. It is also written D8-D2-7C.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in D8:D2:7C:00:00:00 that is D8:D2:7C — 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 JEMA ENERGY, SA located?

JEMA ENERGY, SA is listed at Pº Circuito nº10 Lasarte-Oria Guipuzcoa ES 20160 in the IEEE OUI registry entry for D8:D2:7C. This is the address the organization registered with the IEEE, which may differ from its current operating address.

JEMA ENERGY, SA

MAC address prefix D8:D2:7C is registered to JEMA ENERGY, SA in the IEEE OUI registry. Any device whose MAC address begins with D8:D2:7C has a network interface built by JEMA ENERGY, SA. 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 D8:D2:7C:00:00:00 to D8:D2:7C:FF:FF:FF.

OUI prefix: D8:D2:7C
Hyphen form: D8-D2-7C
MAC range: D8:D2:7C:00:00:00 – D8:D2:7C:FF:FF:FF
Addresses in block: 16,777,216
Organization: JEMA ENERGY, SA
Address: Pº Circuito nº10 Lasarte-Oria Guipuzcoa ES 20160
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 "JEMA ENERGY, SA"
archived source →
2026-07-17Assigned to "JEMA ENERGY, SA"

Nearby in the registry

The prefixes assigned immediately before and after D8:D2:7C:

FAQ

Which company owns MAC address prefix D8:D2:7C?: MAC address prefix D8:D2:7C is registered to JEMA ENERGY, SA in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with D8:D2:7C has a network interface built by JEMA ENERGY, SA.
What is the OUI D8:D2:7C?: D8:D2:7C is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to JEMA ENERGY, SA. It covers every address from D8:D2:7C:00:00:00 to D8:D2:7C:FF:FF:FF, or 16,777,216 addresses in total. It is also written D8-D2-7C.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in D8:D2:7C:00:00:00 that is D8:D2:7C — 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 JEMA ENERGY, SA located?: JEMA ENERGY, SA is listed at Pº Circuito nº10 Lasarte-Oria Guipuzcoa ES 20160 in the IEEE OUI registry entry for D8:D2:7C. This is the address the organization registered with the IEEE, which may differ from its current operating address.