Which company owns MAC address prefix 44:37:19?

MAC address prefix 44:37:19 is registered to 2 Save Energy Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 44:37:19 has a network interface built by 2 Save Energy Ltd.

What is the OUI 44:37:19?

44:37:19 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to 2 Save Energy Ltd. It covers every address from 44:37:19:00:00:00 to 44:37:19:FF:FF:FF, or 16,777,216 addresses in total. It is also written 44-37-19.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 44:37:19:00:00:00 that is 44:37:19 — 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 2 Save Energy Ltd located?

2 Save Energy Ltd is listed at The Annexe, Field House Barn Sherborne St John Hampshire GB RG24 9LR in the IEEE OUI registry entry for 44:37:19. This is the address the organization registered with the IEEE, which may differ from its current operating address.

2 Save Energy Ltd

MAC address prefix 44:37:19 is registered to 2 Save Energy Ltd in the IEEE OUI registry. Any device whose MAC address begins with 44:37:19 has a network interface built by 2 Save Energy Ltd. 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 44:37:19:00:00:00 to 44:37:19:FF:FF:FF.

OUI prefix: 44:37:19
Hyphen form: 44-37-19
MAC range: 44:37:19:00:00:00 – 44:37:19:FF:FF:FF
Addresses in block: 16,777,216
Organization: 2 Save Energy Ltd
Address: The Annexe, Field House Barn Sherborne St John Hampshire GB RG24 9LR
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 "2 Save Energy Ltd"
archived source →
2026-07-17Assigned to "2 Save Energy Ltd"

Nearby in the registry

The prefixes assigned immediately before and after 44:37:19:

FAQ

Which company owns MAC address prefix 44:37:19?: MAC address prefix 44:37:19 is registered to 2 Save Energy Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 44:37:19 has a network interface built by 2 Save Energy Ltd.
What is the OUI 44:37:19?: 44:37:19 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to 2 Save Energy Ltd. It covers every address from 44:37:19:00:00:00 to 44:37:19:FF:FF:FF, or 16,777,216 addresses in total. It is also written 44-37-19.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 44:37:19:00:00:00 that is 44:37:19 — 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 2 Save Energy Ltd located?: 2 Save Energy Ltd is listed at The Annexe, Field House Barn Sherborne St John Hampshire GB RG24 9LR in the IEEE OUI registry entry for 44:37:19. This is the address the organization registered with the IEEE, which may differ from its current operating address.