Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KD9MAJ callsign genealogy
Currently held by JACOBS, MARK
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 KD9MAJ's current licensee, walking backwards.
- JACOBS, MARK AINgranted 2018-04-17cancelled 2018-05-08
Successor callsigns
Callsigns held now by people who previously held KD9MAJ.
No current licensee on record previously held this callsign.