Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W1SD callsign genealogy
Currently held by DALLAS, STEPHEN M
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 W1SD's current licensee, walking backwards.
- DALLAS, STEPHEN MPAgranted 1993-07-06cancelled 1999-12-28
Successor callsigns
Callsigns held now by people who previously held W1SD.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W1SD, oldest first.
- TITCOMB, E C ME1987-12-08 → cancelled 1999-12-09
- DALLAS, STEPHEN M MA2019-10-01 active