Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4CRF callsign genealogy
Currently held by WERTZ, JOHN A B
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 K4CRF's current licensee, walking backwards.
- Ellery, JacobNCgranted 2017-08-18cancelled 2019-07-02
Successor callsigns
Callsigns held now by people who previously held K4CRF.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4CRF, oldest first.
- WERTZ, JOHN A B SC1994-10-19 → cancelled 2006-10-20
- Ellery, Jacob NC2019-07-02 active