Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W9ALM callsign genealogy
Currently held by CALDWELL, WILLIAM C
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 W9ALM's current licensee, walking backwards.
- MESA, ALECWIgranted 2024-03-09cancelled 2024-09-10
Successor callsigns
Callsigns held now by people who previously held W9ALM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W9ALM, oldest first.
- CALDWELL, WILLIAM C CA2005-12-14 → cancelled 2018-02-06
- MESA, ALEC WI2024-09-10 active