Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AF1S callsign genealogy
Currently held by MALUMPHY, WILLIAM 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 AF1S's current licensee, walking backwards.
- MALUMPHY, WILLIAM MMAgranted 2025-08-19cancelled 2025-09-16
Successor callsigns
Callsigns held now by people who previously held AF1S.
- MALUMPHY, WILLIAM MMAgranted 2025-08-19cancelled 2025-09-16
All historical holders
Every license row we've seen with the callsign AF1S, oldest first.
- MALUMPHY, WILLIAM M MA2017-01-11 → cancelled 2025-08-19
- MALUMPHY, WILLIAM M MA2025-09-16 active