The extension is a specialized TLD managed by the European Broadcasting Union (EBU) . It is designed specifically for radio stations, web radios, and audio-related content creators to provide a clearly identifiable online presence.

Many audio-centric sites use country-code TLDs (ccTLDs) like .fm (Micronesia) or .am (Armenia) because they match traditional broadcast bands.

If the specific name you want is already taken, you may consider: Register your .radio Domain Name - OnlyDomains

INWX : A registrar specializing in a wide range of TLDs, including global and specialized endings. 2. The "Radio Test" for Domain Names

A domain passes the test if a listener can hear it once and type it correctly into a browser without needing a visual prompt.