Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4TWD callsign genealogy
Currently held by Drennan, Thomas W
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 K4TWD's current licensee, walking backwards.
- Capps, Robert JALgranted 2019-11-14cancelled 2019-12-03
Successor callsigns
Callsigns held now by people who previously held K4TWD.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4TWD, oldest first.
- Drennan, Thomas W TN2007-05-01 → cancelled 2019-05-02
- Capps, Robert J AL2019-12-03 active