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 IEEE Registration Authority
The IEEE Registration Authority is the body that registers and administers organizationally unique identifiers (OUIs) and related identifiers used across the electronics and computer industries. It is the source of every block listed on this site.
Devices that use these prefixes
- Blocks recorded to the registry itself rather than to a product company
Frequently asked questions
Where do MAC address prefixes come from?
Organizations apply to the IEEE Registration Authority, which assigns them a prefix in one of its block sizes (MA-L, MA-M or MA-S). This site mirrors the public registry and syncs it on a schedule.
Assignments by type
| Type | Count |
|---|---|
| MA-L | 440 |
| MA-S | 1 |
| IAB | 1 |
Countries in IEEE's registration records
| Country | Blocks |
|---|---|
| 🇺🇸 United States | 442 |
Download this organization's blocks
Get just these assignments as CSV or JSON, generated fresh from the live registry on every request.
442 registered prefixes