Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W4KSR callsign genealogy
Currently held by CARLSON, MARK 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 W4KSR's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held W4KSR.
- CARLSON, MARK AMEgranted 2017-11-01
All historical holders
Every license row we've seen with the callsign W4KSR, oldest first.
- CARLSON, MARK A ME1998-10-05 → cancelled 2008-01-29
- Risley, Kenneth S FL2023-04-25 active