Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K0TFS callsign genealogy
Currently held by Foss, Timothy A
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 K0TFS's current licensee, walking backwards.
- Foss, Timothy ACOgranted 2015-07-24cancelled 2015-08-11
Successor callsigns
Callsigns held now by people who previously held K0TFS.
- Steele IV, Thomas FMNgranted 2006-08-29cancelled 2016-05-06
All historical holders
Every license row we've seen with the callsign K0TFS, oldest first.
- Steele IV, Thomas F MN2002-03-26 → cancelled 2006-08-29
- Foss, Timothy A CO2025-05-20 active