Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W1MUD callsign genealogy
Currently held by CHIRDO, CHRISTOPHER 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 W1MUD's current licensee, walking backwards.
- Magnano, Guy FVTgranted 2018-01-18cancelled 2018-02-06
Successor callsigns
Callsigns held now by people who previously held W1MUD.
- CHIRDO, CHRISTOPHER JNYgranted 1999-06-02cancelled 2001-04-17
All historical holders
Every license row we've seen with the callsign W1MUD, oldest first.
- Magnano, Guy F VT2018-02-06 active
- CHIRDO, CHRISTOPHER J— → cancelled 1999-06-02