Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB5CTM callsign genealogy
Currently held by Thomas, Robert 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 KB5CTM's current licensee, walking backwards.
- Thomas, Robert DTXgranted 2019-05-23cancelled 2019-06-29
Successor callsigns
Callsigns held now by people who previously held KB5CTM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KB5CTM, oldest first.
- THOMAS, ROBERT D TX1987-08-11 → cancelled 1999-08-16
- Thomas, Robert D TX2019-06-29 active