Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KC1S callsign genealogy
Currently held by RUBIN, DAVID
The FCC publishes a previous_call_sign on
every amateur license — a self-link to the licensee's prior callsign.
Following those links produces the chain below.
Previous callsigns
Older callsigns held by KC1S's current licensee, walking backwards.
- Stillman, Charles MWAgranted 2008-01-22cancelled 2008-03-14
Successor callsigns
Callsigns held now by people who previously held KC1S.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KC1S, oldest first.
- RUBIN, DAVID MA1995-11-28 → cancelled 2007-11-29
- Stillman, Charles M WA2017-12-27 active