Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K1TF callsign genealogy
Currently held by HORIKOSHI, TSUTOMU
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 K1TF's current licensee, walking backwards.
- Horikoshi, TsutomuCAgranted 2003-12-23cancelled 2004-05-28
Successor callsigns
Callsigns held now by people who previously held K1TF.
- FARRINGTON, THOMAS RAKgranted 2022-02-01
All historical holders
Every license row we've seen with the callsign K1TF, oldest first.
- FARRINGTON, THOMAS R AK1993-05-25 → cancelled 2002-04-09
- HORIKOSHI, TSUTOMU CA2024-04-02 active