Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W3ZI callsign genealogy
Currently held by JOHNSON, MARK 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 W3ZI's current licensee, walking backwards.
- Bono, JackFLgranted 2021-09-10
- Bono, JackFLgranted 2009-07-14cancelled 2011-10-14
- SHEPARD, SEAN MVAgranted 2021-09-23
- SHEPARD, SEAN MVAgranted 2011-03-22cancelled 2011-12-06
- SHEPARD, SEAN MVAgranted 2010-02-11cancelled 2011-03-22
Successor callsigns
Callsigns held now by people who previously held W3ZI.
No current licensee on record previously held this callsign.