Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K0SRZ callsign genealogy
Currently held by ZIMMERMAN, STEVEN R
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 K0SRZ's current licensee, walking backwards.
- ZIMMERMAN, STEVEN RKSgranted 2015-08-18
Successor callsigns
Callsigns held now by people who previously held K0SRZ.
- ZIMMERMAN, STEVEN RKSgranted 2015-08-18
All historical holders
Every license row we've seen with the callsign K0SRZ, oldest first.
- SEATS, ALDEN L CO1997-12-24 → cancelled 2009-12-25
- ZIMMERMAN, STEVEN R KS2014-08-08 → cancelled 2015-08-18