MAC address vendor lookup
Retrieve vendor details and other information regarding a given MAC address or an OUI

MAC address and OUI vendor lookup synced from IEEE, with randomized-MAC detection.
macadress API is a free Development API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
A JSON API for MAC address, vendor, and OUI lookups: single or batch requests, live-synced from IEEE, with a self-hosted option when lookups can't leave your network.
Details from macadress.com.

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Retrieve vendor details and other information regarding a given MAC address or an OUI
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The macadress API is provided by macadress (macadress.com). A JSON API for MAC address, vendor, and OUI lookups: single or batch requests, live-synced from IEEE, with a self-hosted option when lookups can't leave your network.
Yes. The macadress API is listed in the Development category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
No. The macadress API requires no authentication, so you can start making requests without signing up.
Yes. The macadress API supports CORS, so front-end JavaScript can call it directly.
Yes. The macadress API is served over HTTPS, so it's safe to use in production.