Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K1SFC callsign genealogy
Currently held by Robert, Stephen M
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 K1SFC's current licensee, walking backwards.
- Robert, Stephen MNHgranted 2018-12-11cancelled 2019-07-27
Successor callsigns
Callsigns held now by people who previously held K1SFC.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K1SFC, oldest first.
- Ellsworth, George C CT2005-11-21 → cancelled 2018-02-17
- Robert, Stephen M NH2019-07-27 active