Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WD4KNX callsign genealogy
Currently held by Whitmer, John L
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 WD4KNX's current licensee, walking backwards.
- Whitmer, John LVAgranted 2008-05-07cancelled 2009-04-10
Successor callsigns
Callsigns held now by people who previously held WD4KNX.
- Whitmer, John LVAgranted 2008-05-07cancelled 2009-04-10
All historical holders
Every license row we've seen with the callsign WD4KNX, oldest first.
- Whitmer, John L VA2008-05-07 → cancelled 2009-03-12
- Whitmer, John L VA2019-06-18 active