Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K0TDD callsign genealogy
Currently held by Schiefelbein, Matthew K
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 K0TDD's current licensee, walking backwards.
- Schiefelbein, Matthew KMNgranted 2004-09-23cancelled 2009-06-02
Successor callsigns
Callsigns held now by people who previously held K0TDD.
No current licensee on record previously held this callsign.