Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9TYR callsign genealogy
Currently held by DITTMER, TRENTON T
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 K9TYR's current licensee, walking backwards.
- SANDERS, THOMAS HILgranted 2016-06-07cancelled 2016-07-08
Successor callsigns
Callsigns held now by people who previously held K9TYR.
- DITTMER, TRENTON TILgranted 2023-03-07
All historical holders
Every license row we've seen with the callsign K9TYR, oldest first.
- DITTMER, TRENTON T IL2011-08-30 → cancelled 2013-05-24
- Sanders 370, Thomas H IL2026-06-04 active