Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4SP callsign genealogy
Currently held by HILLIARD, ALEXANDER H
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 K4SP's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held K4SP.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4SP, oldest first.
- HILLIARD, ALEXANDER H FL1997-11-04 → cancelled 1999-03-25
- Parker, Steven K VA2022-02-16 active