Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K5OWL callsign genealogy
Currently held by FENSTERMACHER, DONALD R
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 K5OWL's current licensee, walking backwards.
- Briggs, SeanTXgranted 2021-03-01cancelled 2021-07-13
Successor callsigns
Callsigns held now by people who previously held K5OWL.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K5OWL, oldest first.
- FENSTERMACHER, DONALD R NM2009-06-17 → cancelled 2021-06-25
- Briggs, Sean S TX2021-07-13 active