Confidence: Medium · Source: FCC ULS · As of 2026-09-15
K4CSM callsign genealogy
Currently held by Marsh III, John J
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 K4CSM's current licensee, walking backwards.
- Marsh III, John JVAgranted 2009-05-27cancelled 2014-08-15
Successor callsigns
Callsigns held now by people who previously held K4CSM.
- POPE, MILLARD WGAgranted 1999-02-26cancelled 2002-07-09
All historical holders
Every license row we've seen with the callsign K4CSM, oldest first.
- Marsh III, John J VA2014-08-15 → cancelled 2026-08-18
- POPE, MILLARD W— → cancelled 1999-02-26