Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4CXR callsign genealogy
Currently held by WILLIAMS SR, JOHN 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 K4CXR's current licensee, walking backwards.
- Seeboth, Gregory PVAgranted 2017-09-26cancelled 2017-12-08
Successor callsigns
Callsigns held now by people who previously held K4CXR.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4CXR, oldest first.
- WILLIAMS SR, JOHN M FL2006-03-23 → cancelled 2007-02-21
- Seeboth, Gregory P VA2017-12-08 active