Which company owns MAC address prefix D0:46:DC?

MAC address prefix D0:46:DC is registered to Southwest Research Institute in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with D0:46:DC has a network interface built by Southwest Research Institute.

What is the OUI D0:46:DC?

D0:46:DC is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Southwest Research Institute. It covers every address from D0:46:DC:00:00:00 to D0:46:DC:FF:FF:FF, or 16,777,216 addresses in total. It is also written D0-46-DC.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in D0:46:DC:00:00:00 that is D0:46:DC — 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 Southwest Research Institute located?

Southwest Research Institute is listed at 6220 Culebra Road San Antonio Texas US 78238 in the IEEE OUI registry entry for D0:46:DC. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Southwest Research Institute

MAC address prefix D0:46:DC is registered to Southwest Research Institute in the IEEE OUI registry. Any device whose MAC address begins with D0:46:DC has a network interface built by Southwest Research Institute. 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 D0:46:DC:00:00:00 to D0:46:DC:FF:FF:FF.

OUI prefix: D0:46:DC
Hyphen form: D0-46-DC
MAC range: D0:46:DC:00:00:00 – D0:46:DC:FF:FF:FF
Addresses in block: 16,777,216
Organization: Southwest Research Institute
Address: 6220 Culebra Road San Antonio Texas US 78238
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 "Southwest Research Institute"
archived source →
2026-07-17Assigned to "Southwest Research Institute"

Nearby in the registry

The prefixes assigned immediately before and after D0:46:DC:

FAQ

Which company owns MAC address prefix D0:46:DC?: MAC address prefix D0:46:DC is registered to Southwest Research Institute in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with D0:46:DC has a network interface built by Southwest Research Institute.
What is the OUI D0:46:DC?: D0:46:DC is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Southwest Research Institute. It covers every address from D0:46:DC:00:00:00 to D0:46:DC:FF:FF:FF, or 16,777,216 addresses in total. It is also written D0-46-DC.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in D0:46:DC:00:00:00 that is D0:46:DC — 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 Southwest Research Institute located?: Southwest Research Institute is listed at 6220 Culebra Road San Antonio Texas US 78238 in the IEEE OUI registry entry for D0:46:DC. This is the address the organization registered with the IEEE, which may differ from its current operating address.