Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4SPF callsign genealogy
Currently held by Wareham, Donald K
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 W4SPF's current licensee, walking backwards.
- KR4EPZcancelledShell Point Amateur Radio ClubFLgranted 2025-06-14cancelled 2025-07-05
Successor callsigns
Callsigns held now by people who previously held W4SPF.
- WAREHAM, DONALD KFLgranted 2014-01-01cancelled 2023-01-09
All historical holders
Every license row we've seen with the callsign W4SPF, oldest first.
- Wareham, Donald K FL2002-07-16 → cancelled 2004-03-23
- Shell Point Amateur Radio Club FL2025-07-05 active