Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4YXP callsign genealogy
Currently held by Ryerson, 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 K4YXP's current licensee, walking backwards.
- Ryerson, John MVAgranted 2022-03-08cancelled 2022-03-26
Successor callsigns
Callsigns held now by people who previously held K4YXP.
No current licensee on record previously held this callsign.