Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB3MRK callsign genealogy
Currently held by LaBarge, Zachary W
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 KB3MRK's current licensee, walking backwards.
- Schall, MarkPAgranted 2021-01-19cancelled 2021-02-09
Successor callsigns
Callsigns held now by people who previously held KB3MRK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KB3MRK, oldest first.
- LaBarge, Zachary W PA2005-10-07 → cancelled 2017-10-11
- Schall, Mark PA2021-02-09 active