Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KJ4KDC callsign genealogy
Currently held by Frolov, Alexei
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 KJ4KDC's current licensee, walking backwards.
- Frolov, AlexeiVAgranted 2009-02-23cancelled 2009-03-09
Successor callsigns
Callsigns held now by people who previously held KJ4KDC.
- Frolov, AlexeiVAgranted 2019-03-19