Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WX4PTO callsign genealogy
Currently held by Keller, Michael D
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 WX4PTO's current licensee, walking backwards.
- Keller, Michael DFLgranted 2018-04-30cancelled 2018-05-19
Successor callsigns
Callsigns held now by people who previously held WX4PTO.
No current licensee on record previously held this callsign.