Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KK4XX callsign genealogy
Currently held by HARING, DAVID 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 KK4XX's current licensee, walking backwards.
- Sorah, Joshua DNCgranted 2017-10-16cancelled 2024-10-25
Successor callsigns
Callsigns held now by people who previously held KK4XX.
- HARING, DAVID CVAgranted 2018-12-27
All historical holders
Every license row we've seen with the callsign KK4XX, oldest first.
- FRIEDMAN, RICHARD S AZ1997-11-14 → cancelled 2007-04-08
- HARING, DAVID C VA2012-10-16 → cancelled 2018-12-27
- Sorah, Joshua D NC2024-10-25 active