Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AD5S callsign genealogy
Currently held by KOONTZ, JOHN K
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 AD5S's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held AD5S.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AD5S, oldest first.
- DOLLAR, W T TX1994-09-06 → cancelled 2006-09-07
- KOONTZ, JOHN K TX2016-07-08 active