Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AC3K callsign genealogy
Currently held by Sullivan, Patrick M
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 AC3K's current licensee, walking backwards.
- Sullivan, Patrick MDCgranted 2014-05-15cancelled 2016-05-17
Successor callsigns
Callsigns held now by people who previously held AC3K.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AC3K, oldest first.
- BACHELOR, WILLIAM B MD2004-02-03 → cancelled 2016-04-27
- Sullivan, Patrick M DC2026-03-18 active