Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K1SEM callsign genealogy
Currently held by Allison, James 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 K1SEM's current licensee, walking backwards.
- Mabe, StevenOHgranted 2025-07-08cancelled 2025-08-05
Successor callsigns
Callsigns held now by people who previously held K1SEM.
All historical holders
Every license row we've seen with the callsign K1SEM, oldest first.
- Allison, James D MA2014-10-21 → cancelled 2015-04-25
- Mabe, Steven OH2025-08-05 → cancelled 2026-02-27