Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WB4MPC callsign genealogy
Currently held by MUNOZ, MARIO
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 WB4MPC's current licensee, walking backwards.
- Munoz, MarioALgranted 2023-11-01cancelled 2023-11-21
Successor callsigns
Callsigns held now by people who previously held WB4MPC.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WB4MPC, oldest first.
- MUNOZ, MARIO FL1997-11-25 → cancelled 2009-11-26
- Munoz, Mario AL2023-11-21 active