Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KP4ASD callsign genealogy
Currently held by Serrano Diaz jr, Alberto
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 KP4ASD's current licensee, walking backwards.
- Serrano Diaz jr, AlbertoPRgranted 2018-04-07cancelled 2019-11-02
Successor callsigns
Callsigns held now by people who previously held KP4ASD.
- Serrano Diaz jr, AlbertoPRgranted 2018-04-07cancelled 2019-11-02
All historical holders
Every license row we've seen with the callsign KP4ASD, oldest first.
- Serrano Diaz jr, Alberto PR2011-02-12 → cancelled 2018-04-07
- Serrano Diaz jr, Alberto PR2019-11-02 active