Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AC3HR callsign genealogy
Currently held by MARK, ROBERT S
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 AC3HR's current licensee, walking backwards.
- MARK, ROBERT SPAgranted 2021-03-23cancelled 2021-06-23
Successor callsigns
Callsigns held now by people who previously held AC3HR.
No current licensee on record previously held this callsign.