Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AC0S callsign genealogy
Currently held by HAWORTH, DEAN B
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 AC0S's current licensee, walking backwards.
- Whitmore, Colin ACOgranted 2003-06-11cancelled 2004-04-28
Successor callsigns
Callsigns held now by people who previously held AC0S.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AC0S, oldest first.
- HAWORTH, DEAN B CO1997-12-31 → cancelled 2001-02-07
- Whitmore, Colin A CO2024-02-03 active