Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K0POP callsign genealogy
Currently held by Seyffer, Jurg 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 K0POP's current licensee, walking backwards.
- Seyffer, Jurg RCOgranted 2012-05-04cancelled 2012-10-10
Successor callsigns
Callsigns held now by people who previously held K0POP.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K0POP, oldest first.
- SORENSON, NATHAN A ND1999-02-10 → cancelled 2011-02-11
- Seyffer, Jurg R CO2022-08-23 active