Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4RTH callsign genealogy
Currently held by Heinlein, Richard T
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 K4RTH's current licensee, walking backwards.
- Heinlein, Richard TFLgranted 2014-09-29cancelled 2022-08-06
Successor callsigns
Callsigns held now by people who previously held K4RTH.
No current licensee on record previously held this callsign.