Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KP4M callsign genealogy
Currently held by Zayas, Bryan
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 KP4M's current licensee, walking backwards.
- Zayas, BryanPRgranted 2019-09-25cancelled 2020-08-07
Successor callsigns
Callsigns held now by people who previously held KP4M.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KP4M, oldest first.
- COMELLA, JOHN M MA2008-04-24 → cancelled 2020-07-18
- Zayas, Bryan PR2020-08-07 active