Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K1OFO callsign genealogy
Currently held by Biggs, Donny N
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 K1OFO's current licensee, walking backwards.
- Ydrach, Jose JMAgranted 2020-06-01cancelled 2020-11-24
Successor callsigns
Callsigns held now by people who previously held K1OFO.
- Biggs, Donny NTNgranted 2018-07-20
All historical holders
Every license row we've seen with the callsign K1OFO, oldest first.
- Biggs, Donny N TN2017-08-19 → cancelled 2018-07-20
- Ydrach, Jose J MA2020-11-24 active