Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KZ4JPF callsign genealogy
Currently held by Freitag, John P
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 KZ4JPF's current licensee, walking backwards.
- Freitag, John PTNgranted 2010-03-08cancelled 2010-04-13
Successor callsigns
Callsigns held now by people who previously held KZ4JPF.
- Freitag, John PTNgranted 2020-12-14