Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W3MJC callsign genealogy
Currently held by Cieslak, Michael 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 W3MJC's current licensee, walking backwards.
- Cieslak, Michael JPAgranted 2019-07-19cancelled 2020-06-06
Successor callsigns
Callsigns held now by people who previously held W3MJC.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W3MJC, oldest first.
- COX, HENRY L MD1998-10-28 → cancelled 2010-10-29
- Cieslak, Michael J PA2020-06-06 active