Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K1SPF callsign genealogy
Currently held by DUNTZEE III, WILLIAM J
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 K1SPF's current licensee, walking backwards.
- DUNTZEE III, WILLIAM JMAgranted 2016-01-05cancelled 2018-03-27
Successor callsigns
Callsigns held now by people who previously held K1SPF.
No current licensee on record previously held this callsign.