Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4SUP callsign genealogy
Currently held by BLACKFORD SR, WILLIAM H
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 W4SUP's current licensee, walking backwards.
- Walker, Joshua WTNgranted 2024-06-11cancelled 2024-07-16
Successor callsigns
Callsigns held now by people who previously held W4SUP.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4SUP, oldest first.
- BLACKFORD SR, WILLIAM H FL1994-04-05 → cancelled 2006-04-06
- Hasty, Patrick G FL2012-06-05 → cancelled 2024-06-06
- Walker, Joshua W TN2024-07-16 active