Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WA4JSA callsign genealogy
Currently held by ALSOBROOK, JOHN S
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 WA4JSA's current licensee, walking backwards.
- ALSOBROOK, JOHN SFLgranted 2024-02-09cancelled 2024-03-12
Successor callsigns
Callsigns held now by people who previously held WA4JSA.
No current licensee on record previously held this callsign.