Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4TMS callsign genealogy
Currently held by Rader, Richard L
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 W4TMS's current licensee, walking backwards.
- COOK, PHILIP CSCgranted 2020-05-11cancelled 2020-06-01
Successor callsigns
Callsigns held now by people who previously held W4TMS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4TMS, oldest first.
- Rader, Richard L FL2004-12-10 → cancelled 2017-02-23
- Cook, Philip C SC2020-06-01 active