Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4RCP callsign genealogy
Currently held by CASWELL, MARK K
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 K4RCP's current licensee, walking backwards.
- PACKHAM, RHYS CNCgranted 2022-07-02cancelled 2022-07-23
Successor callsigns
Callsigns held now by people who previously held K4RCP.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4RCP, oldest first.
- CASWELL, MARK K FL2006-11-03 → cancelled 2018-11-06
- PACKHAM, RHYS C NC2022-07-23 active