Space Regulatory Glossary Filing Types
callsign
- A unique alphanumeric identifier assigned by the FCC to a licensed satellite system or earth station. Satellite callsigns typically follow the format S followed by a four-digit number (e.g., S2968 for a Starlink authorization).
- Callsigns serve as the primary lookup key across FCC databases and are used to link license applications, modifications, STAs, and enforcement actions to a specific authorization. A single constellation operator may hold dozens of callsigns across different orbital shells and frequency bands.
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