Which company owns MAC address prefix 40:BD:9E?

MAC address prefix 40:BD:9E is registered to Physio-Control, Inc in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 40:BD:9E has a network interface built by Physio-Control, Inc.

What is the OUI 40:BD:9E?

40:BD:9E is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Physio-Control, Inc. It covers every address from 40:BD:9E:00:00:00 to 40:BD:9E:FF:FF:FF, or 16,777,216 addresses in total. It is also written 40-BD-9E.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 40:BD:9E:00:00:00 that is 40:BD:9E — 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 Physio-Control, Inc located?

Physio-Control, Inc is listed at 11811 Willows Rd NE Redmond WA US 98052 in the IEEE OUI registry entry for 40:BD:9E. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Physio-Control, Inc

MAC address prefix 40:BD:9E is registered to Physio-Control, Inc in the IEEE OUI registry. Any device whose MAC address begins with 40:BD:9E has a network interface built by Physio-Control, Inc. 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:BD:9E:00:00:00 to 40:BD:9E:FF:FF:FF.

OUI prefix: 40:BD:9E
Hyphen form: 40-BD-9E
MAC range: 40:BD:9E:00:00:00 – 40:BD:9E:FF:FF:FF
Addresses in block: 16,777,216
Organization: Physio-Control, Inc
Address: 11811 Willows Rd NE Redmond WA US 98052
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 "Physio-Control, Inc"
archived source →
2026-07-17Assigned to "Physio-Control, Inc"

Nearby in the registry

The prefixes assigned immediately before and after 40:BD:9E:

FAQ

Which company owns MAC address prefix 40:BD:9E?: MAC address prefix 40:BD:9E is registered to Physio-Control, Inc in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 40:BD:9E has a network interface built by Physio-Control, Inc.
What is the OUI 40:BD:9E?: 40:BD:9E is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Physio-Control, Inc. It covers every address from 40:BD:9E:00:00:00 to 40:BD:9E:FF:FF:FF, or 16,777,216 addresses in total. It is also written 40-BD-9E.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 40:BD:9E:00:00:00 that is 40:BD:9E — 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 Physio-Control, Inc located?: Physio-Control, Inc is listed at 11811 Willows Rd NE Redmond WA US 98052 in the IEEE OUI registry entry for 40:BD:9E. This is the address the organization registered with the IEEE, which may differ from its current operating address.