Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W1DYN callsign genealogy
Currently held by Shapiro PhD, Jonathan 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 W1DYN's current licensee, walking backwards.
- Shapiro, Jonathan SCTgranted 2017-03-01cancelled 2021-01-08
Successor callsigns
Callsigns held now by people who previously held W1DYN.
- Shapiro PhD, Jonathan SCTgranted 2026-01-03