Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AB1DM callsign genealogy
Currently held by Koning, P T
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 AB1DM's current licensee, walking backwards.
- McNaughton, Daniel JCTgranted 2020-03-20cancelled 2026-08-14
Successor callsigns
Callsigns held now by people who previously held AB1DM.
- Koning, P TVTgranted 2004-04-17cancelled 2009-05-19
All historical holders
Every license row we've seen with the callsign AB1DM, oldest first.
- Koning, P T VT2004-03-22 → cancelled 2004-04-17
- McNaughton, Daniel J CT2026-08-14 active