Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KP4MFO callsign genealogy
Currently held by Figueroa-Ostolaza, Melvin
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 KP4MFO's current licensee, walking backwards.
- Figueroa-Ostolaza, MelvinPRgranted 2011-08-04cancelled 2011-10-21
Successor callsigns
Callsigns held now by people who previously held KP4MFO.
- Figueroa-Ostolaza, MelvinPRgranted 2017-06-30