Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KC9ZBM callsign genealogy
Currently held by ROBB, RYAN
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 KC9ZBM's current licensee, walking backwards.
- ROBB, RYANINgranted 2013-03-25cancelled 2013-05-23
Successor callsigns
Callsigns held now by people who previously held KC9ZBM.
- ROBB, RYANINgranted 2023-05-23