Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AC5ZM callsign genealogy
Currently held by Thompson, Mark J
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 AC5ZM's current licensee, walking backwards.
- Thompson, Mark JTXgranted 2000-06-15cancelled 2000-08-01
Successor callsigns
Callsigns held now by people who previously held AC5ZM.
- Thompson, Mark JTXgranted 2020-06-01