Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KM4TF callsign genealogy
Currently held by Stewart, John L
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 KM4TF's current licensee, walking backwards.
- Stewart, John LTXgranted 2023-05-16cancelled 2023-06-03
Successor callsigns
Callsigns held now by people who previously held KM4TF.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KM4TF, oldest first.
- STEWART, JOHN L SC2009-09-29 → cancelled 2021-09-30
- Stewart, John L TX2023-06-03 active