Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KZ4WTF callsign genealogy
Currently held by KELDAHL, 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 KZ4WTF's current licensee, walking backwards.
- KELDAHL, WILLIAM JTNgranted 2016-10-31cancelled 2018-02-06
Successor callsigns
Callsigns held now by people who previously held KZ4WTF.
No current licensee on record previously held this callsign.