Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4MGR callsign genealogy
Currently held by Gruber, Michael
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 K4MGR's current licensee, walking backwards.
- Gruber, MichaelFLgranted 2005-08-23cancelled 2005-09-13
Successor callsigns
Callsigns held now by people who previously held K4MGR.
No current licensee on record previously held this callsign.