Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KM4VLD callsign genealogy
Currently held by Thames, Arc 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 KM4VLD's current licensee, walking backwards.
- Calkin, Mark WNCgranted 2024-05-18cancelled 2024-06-08
Successor callsigns
Callsigns held now by people who previously held KM4VLD.
- Thames, Arc JFLgranted 2026-07-28
All historical holders
Every license row we've seen with the callsign KM4VLD, oldest first.
- Thames, Arc J FL2016-07-19 → cancelled 2016-08-06
- Calkin, Mark W NC2024-06-08 active