Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9IV callsign genealogy
Currently held by ROSENSTEIN, ROBERT 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 K9IV's current licensee, walking backwards.
- ROSENSTEIN, ROBERT SILgranted 1991-06-04cancelled 2000-04-28
Successor callsigns
Callsigns held now by people who previously held K9IV.
No current licensee on record previously held this callsign.