Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K5STU callsign genealogy
Currently held by SMITH, STUART M
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 K5STU's current licensee, walking backwards.
- SMITH, STUART MTXgranted 2014-01-08cancelled 2020-05-19
Successor callsigns
Callsigns held now by people who previously held K5STU.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K5STU, oldest first.
- SWARTZ, STUART D TX2008-04-15 → cancelled 2020-04-29
- SMITH, STUART M TX2020-05-19 active