Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KM4IVZ callsign genealogy
Currently held by Byrne, Douglas 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 KM4IVZ's current licensee, walking backwards.
- Byrne, Douglas PFLgranted 2015-01-06cancelled 2015-03-18
Successor callsigns
Callsigns held now by people who previously held KM4IVZ.
- Byrne, Douglas PFLgranted 2025-04-08