Confidence: Medium · Source: FCC ULS · As of 2026-09-14
AD0CO callsign genealogy
Currently held by Colorado Amateur Radio Emergency Services
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 AD0CO's current licensee, walking backwards.
- KF0ILIcancelledColorado Amateur Radio Emergency ServicesCOgranted 2022-03-24cancelled 2022-04-12
Successor callsigns
Callsigns held now by people who previously held AD0CO.
- Abma, Curtis MMOgranted 2025-02-19
All historical holders
Every license row we've seen with the callsign AD0CO, oldest first.
- Abma, Curtis M MO2012-12-06 → cancelled 2015-05-12
- Colorado Amateur Radio Emergency Services CO2022-04-12 active