Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K7SDU callsign genealogy
Currently held by Cummings, Gregory 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 K7SDU's current licensee, walking backwards.
- Cummings, Matthew JWAgranted 2011-05-11cancelled 2011-06-14
Successor callsigns
Callsigns held now by people who previously held K7SDU.
- Cummings, Gregory SWAgranted 2017-10-03
All historical holders
Every license row we've seen with the callsign K7SDU, oldest first.
- Cummings, Gregory S WA2004-01-23 → cancelled 2007-11-09
- Cummings, Matthew J WA2011-06-14 → cancelled 2023-07-12