Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W0BZX callsign genealogy
Currently held by ROCKLIN, ISADORE J
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 W0BZX's current licensee, walking backwards.
- Molzahn, Michael DMNgranted 2014-01-15cancelled 2014-02-11
Successor callsigns
Callsigns held now by people who previously held W0BZX.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W0BZX, oldest first.
- ROCKLIN, ISADORE J IA1988-06-28 → cancelled 2000-06-29
- Molzahn, Michael D MN2024-11-26 active