Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K1PTO callsign genealogy
Currently held by Obuchowski, Peter T
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 K1PTO's current licensee, walking backwards.
- Obuchowski, Peter TCTgranted 2022-04-12cancelled 2022-04-30
Successor callsigns
Callsigns held now by people who previously held K1PTO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K1PTO, oldest first.
- SWANK, DOUGLAS L MA1993-12-14 → cancelled 2005-12-15
- Obuchowski, Peter T CT2022-04-30 active