Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB9QIS callsign genealogy
Currently held by LUDWIG, DEREK 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 KB9QIS's current licensee, walking backwards.
The current licensee has not held any other callsign on record.
Successor callsigns
Callsigns held now by people who previously held KB9QIS.
- LUDWIG, DEREK SMDgranted 2006-10-31cancelled 2018-11-01