Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AK4SP callsign genealogy
Currently held by MASAAKI, TAKAHASHI
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 AK4SP's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held AK4SP.
No current licensee on record previously held this callsign.