Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N4KSB callsign genealogy
Currently held by Barthelme, Keith S
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 N4KSB's current licensee, walking backwards.
- Barthelme, Keith SFLgranted 2008-02-21cancelled 2008-04-12
Successor callsigns
Callsigns held now by people who previously held N4KSB.
No current licensee on record previously held this callsign.