Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K0SFD callsign genealogy
Currently held by Schlenk, 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 K0SFD's current licensee, walking backwards.
- Schlenk, Matthew JMNgranted 2018-04-19cancelled 2018-05-11
Successor callsigns
Callsigns held now by people who previously held K0SFD.
No current licensee on record previously held this callsign.