Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N9RDZ callsign genealogy
Currently held by SIGMAN, CLAUD C
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 N9RDZ's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held N9RDZ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N9RDZ, oldest first.
- SIGMAN, CLAUD C IN2003-04-22 → cancelled 2015-06-30
- SHERMAN, JACOB C IN2025-07-15 active