Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K3GDI callsign genealogy
Currently held by Isringhaus, Greg D
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 K3GDI's current licensee, walking backwards.
- Isringhaus, Greg DMOgranted 2001-07-27cancelled 2011-04-26
Successor callsigns
Callsigns held now by people who previously held K3GDI.
- Isringhaus, Greg DMOgranted 2021-07-30
All historical holders
Every license row we've seen with the callsign K3GDI, oldest first.
- BAIR, FRANK PA1995-02-28 → cancelled 2007-03-01
- Isringhaus, Greg D MO2011-04-26 → cancelled 2011-10-21