Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4CTF callsign genealogy
Currently held by Schlemmer, Marc W
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 K4CTF's current licensee, walking backwards.
- Schlemmer, Marc WTNgranted 2017-03-02cancelled 2018-05-15
Successor callsigns
Callsigns held now by people who previously held K4CTF.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4CTF, oldest first.
- MC COMBS JR, ROBERT C SC2005-05-11 → cancelled 2017-06-09
- Schlemmer, Marc W TN2018-05-15 active