Confidence: Medium · Source: FCC ULS · As of 2026-09-12
NP3MJ callsign genealogy
Currently held by MONTERREY, JOAN
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 NP3MJ's current licensee, walking backwards.
- Monterrey, JoanPRgranted 2020-09-08cancelled 2020-12-18
Successor callsigns
Callsigns held now by people who previously held NP3MJ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign NP3MJ, oldest first.
- CASANOVA SERRANO, MEI LING PR1997-04-15 → cancelled 2009-04-16
- MONTERREY, JOAN PR2020-12-18 active