Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB5DTX callsign genealogy
Currently held by SULLIVAN, ROBERT B
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 KB5DTX's current licensee, walking backwards.
- Rubio, David RTXgranted 2021-06-25cancelled 2021-07-16
Successor callsigns
Callsigns held now by people who previously held KB5DTX.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KB5DTX, oldest first.
- SULLIVAN, ROBERT B MS2007-08-14 → cancelled 2019-09-17
- Rubio, David R TX2021-07-16 active