Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KG4ZRN callsign genealogy
Currently held by Haefner, Thomas 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 KG4ZRN's current licensee, walking backwards.
- Haefner, Thomas JFLgranted 2002-10-22cancelled 2003-04-16
Successor callsigns
Callsigns held now by people who previously held KG4ZRN.
- Haefner, Thomas JFLgranted 2022-10-04