Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KC4COS callsign genealogy
Currently held by STEVENS, 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 KC4COS's current licensee, walking backwards.
- Stevens, Mark AVAgranted 2020-07-27cancelled 2020-08-15
Successor callsigns
Callsigns held now by people who previously held KC4COS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KC4COS, oldest first.
- STEVENS, MARK A VA1997-08-22 → cancelled 2009-08-25
- Stevens, Mark A VA2020-08-15 active