Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W4ZTX callsign genealogy
Currently held by Hartline, Gary 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 W4ZTX's current licensee, walking backwards.
- Hartline, Gary DALgranted 2015-03-20cancelled 2015-12-15
Successor callsigns
Callsigns held now by people who previously held W4ZTX.
No current licensee on record previously held this callsign.