Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K1NDU callsign genealogy
Currently held by ENGSTROM, DONALD 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 K1NDU's current licensee, walking backwards.
- Medeiros, Thomas MMAgranted 2021-12-21cancelled 2022-04-29
Successor callsigns
Callsigns held now by people who previously held K1NDU.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K1NDU, oldest first.
- ENGSTROM, DONALD R MA2007-10-19 → cancelled 2020-01-08
- Medeiros, Thomas M MA2022-04-29 active