Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AH0DU callsign genealogy
Currently held by KOLCSEY, ISTVAN
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 AH0DU's current licensee, walking backwards.
- KOLCSEY, ISTVANMPgranted 2025-12-12cancelled 2026-01-03
Successor callsigns
Callsigns held now by people who previously held AH0DU.
No current licensee on record previously held this callsign.