Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KP4HMR callsign genealogy
Currently held by Matias Rivera, Heriberto
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 KP4HMR's current licensee, walking backwards.
- Matias Rivera, HeribertoPRgranted 2017-12-20cancelled 2018-11-27
Successor callsigns
Callsigns held now by people who previously held KP4HMR.
No current licensee on record previously held this callsign.