Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W5TWB callsign genealogy
Currently held by SHIMKUS, ROBERT P
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 W5TWB's current licensee, walking backwards.
- BISHOP, THOMAS WTXgranted 2016-09-29cancelled 2022-03-18
Successor callsigns
Callsigns held now by people who previously held W5TWB.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W5TWB, oldest first.
- SHIMKUS, ROBERT P TX2007-02-21 → cancelled 2019-02-22
- BISHOP, THOMAS W TX2022-03-18 active