Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K1RES callsign genealogy
Currently held by Spero, Robert E
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 K1RES's current licensee, walking backwards.
- Spero, Robert ECAgranted 2021-05-17cancelled 2021-06-07
Successor callsigns
Callsigns held now by people who previously held K1RES.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K1RES, oldest first.
- WILLIAMSON, PETER C ME2006-09-07 → cancelled 2018-12-04
- Spero, Robert E CA2021-06-07 active