Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K3CZM callsign genealogy
Currently held by PORTER JR, JOHN B
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 K3CZM's current licensee, walking backwards.
- WYBLE, RICHARD DWIgranted 2007-07-24cancelled 2016-04-05
Successor callsigns
Callsigns held now by people who previously held K3CZM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K3CZM, oldest first.
- PORTER JR, JOHN B PA1999-12-04 → cancelled 2012-02-07
- WYBLE, RICHARD D WI2016-04-05 active