Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4ISK callsign genealogy
Currently held by POTYANDY, GILBERT 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 K4ISK's current licensee, walking backwards.
- Korpershoek, Isaac SFLgranted 2019-11-20cancelled 2019-12-13
Successor callsigns
Callsigns held now by people who previously held K4ISK.
- POTYANDY, GILBERT EFLgranted 2017-08-08
All historical holders
Every license row we've seen with the callsign K4ISK, oldest first.
- BLANCHARD, JOHN L FL2003-12-02 → cancelled 2015-12-03
- Korpershoek, Isaac S FL2019-12-13 active
- POTYANDY, GILBERT E— → cancelled 1997-10-16