Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K1JAC callsign genealogy
Currently held by THOMAS, JACOB
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 K1JAC's current licensee, walking backwards.
- THOMAS, JACOBORgranted 2010-04-21cancelled 2013-06-28
Successor callsigns
Callsigns held now by people who previously held K1JAC.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K1JAC, oldest first.
- JOHNSON, KARL E FL1999-07-29 → cancelled 2011-07-30
- THOMAS, JACOB OR2023-05-11 active