Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W3OST callsign genealogy
Currently held by Surdacki, Richard 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 W3OST's current licensee, walking backwards.
- Surdacki, Richard MMDgranted 2021-11-09cancelled 2022-05-10
Successor callsigns
Callsigns held now by people who previously held W3OST.
- Surdacki, Richard MMDgranted 2026-04-10
All historical holders
Every license row we've seen with the callsign W3OST, oldest first.
- SHAMONSKY, MATTHEW T PA1997-11-13 → cancelled 2009-11-14
- Surdacki, Richard M MD2022-05-10 → cancelled 2026-04-10