Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W4ZKK callsign genealogy
Currently held by TROLINGER, JOHN D
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 W4ZKK's current licensee, walking backwards.
- TROLINGER, JOHN DMDgranted 1998-08-27cancelled 2001-03-16
Successor callsigns
Callsigns held now by people who previously held W4ZKK.
- TROLINGER, JOHN DTXgranted 2024-05-25