Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4TPI callsign genealogy
Currently held by JOHNSON, JOHN D
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 W4TPI's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held W4TPI.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4TPI, oldest first.
- JOHNSON, JOHN D WI1995-01-31 → cancelled 2007-02-01
- Mozdzier, Joshua J VA2024-06-08 active