Confidence: Medium · Source: FCC ULS · As of 2026-09-14
WA1RZO callsign genealogy
Currently held by Slade, John M
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 WA1RZO's current licensee, walking backwards.
- SLADE, JOHN MMAgranted 2002-05-16cancelled 2006-01-24
Successor callsigns
Callsigns held now by people who previously held WA1RZO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WA1RZO, oldest first.
- FLOOD, ROBERT E MA1989-02-28 → cancelled 2001-03-01
- Slade, John M MA2025-12-12 active