Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K0TGU callsign genealogy
Currently held by Hallberg, Sophia 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 K0TGU's current licensee, walking backwards.
- Hallberg, Sophia LORgranted 2022-08-16cancelled 2026-03-31
Successor callsigns
Callsigns held now by people who previously held K0TGU.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K0TGU, oldest first.
- HALLBERG, MARY J KS2015-10-28 → cancelled 2024-04-09
- Hallberg, Sophia L OR2026-03-31 active