Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KD0SMO callsign genealogy
Currently held by Appelbaum, Lawrence H
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 KD0SMO's current licensee, walking backwards.
- O'KONEK, STEVEN MIAgranted 2020-02-27cancelled 2020-03-17
Successor callsigns
Callsigns held now by people who previously held KD0SMO.
- Appelbaum, Lawrence HMOgranted 2023-03-25
All historical holders
Every license row we've seen with the callsign KD0SMO, oldest first.
- Appelbaum, Lawrence H MO2012-07-11 → cancelled 2012-07-20
- O'KONEK, STEVEN M IA2020-03-17 active