Confidence: Medium · Source: FCC ULS · As of 2026-09-12
NK6X callsign genealogy
Currently held by BYLSMA, WILLIAM
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 NK6X's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held NK6X.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign NK6X, oldest first.
- BYLSMA, WILLIAM MD2007-11-21 → cancelled 2019-11-22
- Geoghegan, William CA2020-01-04 active