Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N4XRF callsign genealogy
Currently held by KERSTING, SOPHIA A
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 N4XRF's current licensee, walking backwards.
- KERSTING, SOPHIA AFLgranted 2008-10-31cancelled 2009-04-24
Successor callsigns
Callsigns held now by people who previously held N4XRF.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N4XRF, oldest first.
- STEINHOFF, ROBERT J FL1989-12-26 → cancelled 2002-03-07
- KERSTING, SOPHIA A FL2009-04-24 → cancelled 2021-04-27