Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KC3RFR callsign genealogy
Currently held by Rosenzweig, Robert
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 KC3RFR's current licensee, walking backwards.
- Rosenzweig, RobertPAgranted 2020-11-18cancelled 2021-01-01
Successor callsigns
Callsigns held now by people who previously held KC3RFR.
No current licensee on record previously held this callsign.