Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KJ4DIY callsign genealogy
Currently held by Reichert, Matthew J
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 KJ4DIY's current licensee, walking backwards.
- Reichert, Matthew JVAgranted 2015-09-25cancelled 2015-10-16
Successor callsigns
Callsigns held now by people who previously held KJ4DIY.
- Witzenburger, Howard JFLgranted 2018-02-02
All historical holders
Every license row we've seen with the callsign KJ4DIY, oldest first.
- Witzenburger, Howard J FL2008-04-16 → cancelled 2009-03-03
- Reichert, Matthew J AE2025-08-19 active