Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4SPO callsign genealogy
Currently held by Piwowarski, Paul E
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 K4SPO's current licensee, walking backwards.
- PIWOWARSKI, PAUL EKYgranted 2008-09-15cancelled 2008-10-07
Successor callsigns
Callsigns held now by people who previously held K4SPO.
No current licensee on record previously held this callsign.