Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AC0XO callsign genealogy
Currently held by ABRAHAM, MARK A
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 AC0XO's current licensee, walking backwards.
- ABRAHAM, MARK AKSgranted 2011-08-22cancelled 2011-09-20
Successor callsigns
Callsigns held now by people who previously held AC0XO.
- ABRAHAM, MARK AKSgranted 2021-07-20