Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4SPF callsign genealogy
Currently held by Friedman, Fred
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 K4SPF's current licensee, walking backwards.
- Friedman, FredFLgranted 2023-05-18cancelled 2023-06-22
Successor callsigns
Callsigns held now by people who previously held K4SPF.
No current licensee on record previously held this callsign.