Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4LHP callsign genealogy
Currently held by SPARK, JOHN 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 W4LHP's current licensee, walking backwards.
- Blackwell, Jean CMNgranted 2006-08-16cancelled 2009-07-07
Successor callsigns
Callsigns held now by people who previously held W4LHP.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4LHP, oldest first.
- SPARK, JOHN R FL1998-01-09 → cancelled 2005-01-19
- Blackwell, Jean C FL2020-12-29 active