Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KK4MDP callsign genealogy
Currently held by Stone, Richard 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 KK4MDP's current licensee, walking backwards.
- Stone, Richard JALgranted 2025-09-12cancelled 2025-09-30
Successor callsigns
Callsigns held now by people who previously held KK4MDP.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KK4MDP, oldest first.
- Stone, Richard J AL2012-10-18 → cancelled 2024-11-21
- Stone, Richard J AL2025-09-30 active