Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KP4SM callsign genealogy
Currently held by SAMAR TANOS RADIO GROUP
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 KP4SM's current licensee, walking backwards.
- WP4NPOcancelledSAMAR TANOS RADIO GROUPPRgranted 2016-02-26cancelled 2016-04-12
Successor callsigns
Callsigns held now by people who previously held KP4SM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KP4SM, oldest first.
- BIASCOECHEA, EDUARDO PR1997-07-15 → cancelled 2009-07-16
- SAMAR TANOS RADIO GROUP PR2016-04-12 active