Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W4FMK callsign genealogy
Currently held by KAISER, FRANK 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 W4FMK's current licensee, walking backwards.
- KAISER, FRANK MNCgranted 2016-08-15cancelled 2016-09-09
Successor callsigns
Callsigns held now by people who previously held W4FMK.
No current licensee on record previously held this callsign.