Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4TWM callsign genealogy
Currently held by MARSH, MONTY M
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 K4TWM's current licensee, walking backwards.
- WILSON, MICHAEL ANCgranted 2016-10-24cancelled 2017-04-18
Successor callsigns
Callsigns held now by people who previously held K4TWM.
- MARSH, MONTY MNCgranted 2003-02-28cancelled 2003-08-01
All historical holders
Every license row we've seen with the callsign K4TWM, oldest first.
- MARSH, MONTY M NC2001-04-27 → cancelled 2003-02-28
- MARSH, MONTY M NC2003-08-01 → cancelled 2015-08-04
- WILSON, MICHAEL A NC2017-04-18 active