Every MAC/OUI block IEEE has registered to this exact organization name, combined.
Registered nameSouthwest Research Institute
Total assignments2
Total address capacity16,781,312
First tracked hereAug 22, 2026
Last changed hereAug 22, 2026
SourceIEEE Registration Authority
Vendor registration identifies the organization holding a block, not a specific device model, product line, or manufacturing date. This page combines every block IEEE has registered under this exact organization name; it doesn't mean every address in every listed block is currently shipping in a real device.
About Southwest Research Institute
Southwest Research Institute is a San Antonio nonprofit applied research organization, founded in 1947, that does contract research for government and industry.
Devices that use these prefixes
- Research and test equipment
Assignments by type
| Type | Count |
|---|---|
| MA-L | 1 |
| IAB | 1 |
Countries in IEEE's registration records
| Country | Blocks |
|---|---|
| 🇺🇸 United States | 2 |
Download this organization's blocks
Get just these assignments as CSV or JSON, generated fresh from the live registry on every request.
2 registered prefixes
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