Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N1ZK callsign genealogy
Currently held by TREADWELL, RUSSELL 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 N1ZK's current licensee, walking backwards.
- TREADWELL, RUSSELL CSCgranted 2007-01-30cancelled 2016-05-27
Successor callsigns
Callsigns held now by people who previously held N1ZK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N1ZK, oldest first.
- HIBBARD, ROBERT E FL2005-02-15 → cancelled 2014-05-06
- TREADWELL, RUSSELL C SC2016-05-27 active