Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K1ACH callsign genealogy
Currently held by Alden, Mark
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 K1ACH's current licensee, walking backwards.
- Alden, MarkAPgranted 2021-02-01cancelled 2021-02-27
Successor callsigns
Callsigns held now by people who previously held K1ACH.
No current licensee on record previously held this callsign.