Confidence: Medium · Source: FCC ULS · As of 2026-09-09
K1OSU callsign genealogy
Currently held by MISHLER, DARRELL W
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 K1OSU's current licensee, walking backwards.
- MISHLER, DARRELL WORgranted 2023-05-12cancelled 2023-07-28
Successor callsigns
Callsigns held now by people who previously held K1OSU.
- MISHLER, DARRELL WORgranted 2024-10-22