Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KM4ZT callsign genealogy
Currently held by ALVAREZ, MANUEL P
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 KM4ZT's current licensee, walking backwards.
- Alvarez, Manuel PFLgranted 2005-06-03cancelled 2011-02-05
Successor callsigns
Callsigns held now by people who previously held KM4ZT.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KM4ZT, oldest first.
- ALVAREZ, MANUEL P FL1990-07-10 → cancelled 2002-07-11
- Alvarez, Manuel P FL2021-01-11 active