Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KP4FBM callsign genealogy
Currently held by BALAEZ, FREDY
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 KP4FBM's current licensee, walking backwards.
- BALAEZ, FREDYPRgranted 2018-12-03cancelled 2019-03-05
Successor callsigns
Callsigns held now by people who previously held KP4FBM.
- MASSO, JOSE MPRgranted 2024-05-23
All historical holders
Every license row we've seen with the callsign KP4FBM, oldest first.
- MASSO, JOSE M PR2008-10-21 → cancelled 2014-07-15
- BALAEZ, FREDY PR2019-03-05 active