Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KD4TMH callsign genealogy
Currently held by HERSCHLEIN, THOMAS M
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 KD4TMH's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KD4TMH.
No current licensee on record previously held this callsign.