Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KK4ASS callsign genealogy
Currently held by Galvan, Robert C
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 KK4ASS's current licensee, walking backwards.
- Galvan, Robert CFLgranted 2023-10-31cancelled 2023-11-18
Successor callsigns
Callsigns held now by people who previously held KK4ASS.
- SINGER, JEFFREY WFLgranted 2020-02-28
All historical holders
Every license row we've seen with the callsign KK4ASS, oldest first.
- SINGER, JEFFREY W FL2009-02-13 → cancelled 2009-06-02
- Galvan, Robert C FL2023-11-18 active