Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KR4DR callsign genealogy
Currently held by KOTLAS SR, JOHN J
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 KR4DR's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KR4DR.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KR4DR, oldest first.
- KOTLAS SR, JOHN J NC2003-06-26 → cancelled 2015-09-22
- Kotlas Sr, John J NC2016-01-26 active