Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KD4NAP callsign genealogy
Currently held by SHARP, CHARLES R
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 KD4NAP's current licensee, walking backwards.
- SHARP, CHARLES RPAgranted 2007-05-21cancelled 2007-06-09
Successor callsigns
Callsigns held now by people who previously held KD4NAP.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KD4NAP, oldest first.
- SHARP, KEN FL1993-11-09 → cancelled 2005-11-10
- SHARP, CHARLES R PA2017-04-04 active