Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N1SGW callsign genealogy
Currently held by DE COSTER, MARYANNE C
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 N1SGW's current licensee, walking backwards.
- WADLOW, STEPHENMAgranted 2021-11-13cancelled 2021-12-21
Successor callsigns
Callsigns held now by people who previously held N1SGW.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N1SGW, oldest first.
- DE COSTER, MARYANNE C MA2004-04-15 → cancelled 2016-07-12
- WADLOW, STEPHEN MA2021-12-21 active