Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4GSA callsign genealogy
Currently held by Greiff, 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 K4GSA's current licensee, walking backwards.
- Greiff, MichaelTNgranted 2020-12-22cancelled 2021-01-09
Successor callsigns
Callsigns held now by people who previously held K4GSA.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4GSA, oldest first.
- POEHLER, HORST A FL1995-01-26 → cancelled 2007-01-27
- Greiff, Michael TN2021-01-09 active