Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W9CSA callsign genealogy
Currently held by Allen, Christopher S
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 W9CSA's current licensee, walking backwards.
- KD9UMEcancelledCentral Sands Radio Amateur Radio ClubWIgranted 2022-02-28cancelled 2022-03-19
Successor callsigns
Callsigns held now by people who previously held W9CSA.
- ALLEN, CHRISTOPHER STXgranted 2016-06-01
All historical holders
Every license row we've seen with the callsign W9CSA, oldest first.
- Allen, Christopher S TX2014-12-02 → cancelled 2016-06-01
- Central Sands Radio Amateur Radio Club WI2022-03-19 active