Which company owns MAC address prefix 40:B9:3C?

MAC address prefix 40:B9:3C is registered to Hewlett Packard Enterprise in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 40:B9:3C has a network interface built by Hewlett Packard Enterprise.

What is the OUI 40:B9:3C?

40:B9:3C is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Hewlett Packard Enterprise. It covers every address from 40:B9:3C:00:00:00 to 40:B9:3C:FF:FF:FF, or 16,777,216 addresses in total. It is also written 40-B9-3C.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 40:B9:3C:00:00:00 that is 40:B9:3C — 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 Hewlett Packard Enterprise located?

Hewlett Packard Enterprise is listed at 8000 Foothills Blvd. Roseville CA US 95747 in the IEEE OUI registry entry for 40:B9:3C. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does Hewlett Packard Enterprise own?

Hewlett Packard Enterprise holds 176 OUI prefixes in the IEEE registry, of which 40:B9:3C is one. A device made by Hewlett Packard Enterprise could carry a MAC address from any of them.

Hewlett Packard Enterprise

MAC address prefix 40:B9:3C is registered to Hewlett Packard Enterprise in the IEEE OUI registry. Any device whose MAC address begins with 40:B9:3C has a network interface built by Hewlett Packard Enterprise. 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 40:B9:3C:00:00:00 to 40:B9:3C:FF:FF:FF.

OUI prefix: 40:B9:3C
Hyphen form: 40-B9-3C
MAC range: 40:B9:3C:00:00:00 – 40:B9:3C:FF:FF:FF
Addresses in block: 16,777,216
Organization: Hewlett Packard Enterprise
Address: 8000 Foothills Blvd. Roseville CA US 95747
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.

Other prefixes from Hewlett Packard Enterprise

Hewlett Packard Enterprise holds 176 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

Assignment history (2)

The IEEE registry publishes current state only — this is the change record we've kept since we started tracking it daily.

2017-09-08Assigned to "Hewlett Packard Enterprise"
archived source →
2026-07-17Assigned to "Hewlett Packard Enterprise"

Nearby in the registry

The prefixes assigned immediately before and after 40:B9:3C:

FAQ

Which company owns MAC address prefix 40:B9:3C?: MAC address prefix 40:B9:3C is registered to Hewlett Packard Enterprise in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 40:B9:3C has a network interface built by Hewlett Packard Enterprise.
What is the OUI 40:B9:3C?: 40:B9:3C is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Hewlett Packard Enterprise. It covers every address from 40:B9:3C:00:00:00 to 40:B9:3C:FF:FF:FF, or 16,777,216 addresses in total. It is also written 40-B9-3C.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 40:B9:3C:00:00:00 that is 40:B9:3C — 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 Hewlett Packard Enterprise located?: Hewlett Packard Enterprise is listed at 8000 Foothills Blvd. Roseville CA US 95747 in the IEEE OUI registry entry for 40:B9:3C. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Hewlett Packard Enterprise own?: Hewlett Packard Enterprise holds 176 OUI prefixes in the IEEE registry, of which 40:B9:3C is one. A device made by Hewlett Packard Enterprise could carry a MAC address from any of them.