Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9MTH callsign genealogy
Currently held by Hamm, Matthew 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 K9MTH's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held K9MTH.
No current licensee on record previously held this callsign.