Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4HTO callsign genealogy
Currently held by MASTERMAN, HOWARD W
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 K4HTO's current licensee, walking backwards.
- KJ4ZYYcancelledHOWARD W MASTERMAN MEMORIAL ARCFLgranted 2011-01-26cancelled 2011-04-26
Successor callsigns
Callsigns held now by people who previously held K4HTO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4HTO, oldest first.
- MASTERMAN, HOWARD W WA1997-01-13 → cancelled 2009-01-14
- HOWARD W MASTERMAN MEMORIAL ARC FL2021-02-04 active