Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WC9K callsign genealogy
Currently held by HOLSTEIN, FREDERICK W
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 WC9K's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held WC9K.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WC9K, oldest first.
- HOLSTEIN, FREDERICK W WI1998-02-27 → cancelled 2010-03-02
- Harrison, Kenneth L OR2020-03-12 active