Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4SDC callsign genealogy
Currently held by WEST, ALTON L
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 W4SDC's current licensee, walking backwards.
- Cronin, Stephen DFLgranted 2014-12-15cancelled 2015-01-27
Successor callsigns
Callsigns held now by people who previously held W4SDC.
- Cronin, Stephen DTXgranted 2026-02-20
All historical holders
Every license row we've seen with the callsign W4SDC, oldest first.
- WEST, ALTON L FL2000-01-19 → cancelled 2012-02-07
- Cronin, Stephen D TX2024-11-13 → cancelled 2026-02-20