Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4ISP callsign genealogy
Currently held by KERFOOT, JONATHAN L
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 K4ISP's current licensee, walking backwards.
- KERFOOT, JONATHAN LOKgranted 2003-04-23cancelled 2007-05-11
Successor callsigns
Callsigns held now by people who previously held K4ISP.
- KERFOOT, JONATHAN LOKgranted 2024-03-19