Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4SFD callsign genealogy
Currently held by Ackermann, Peter 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 W4SFD's current licensee, walking backwards.
- Sasser, BrandonTNgranted 2026-03-24cancelled 2026-04-17
Successor callsigns
Callsigns held now by people who previously held W4SFD.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4SFD, oldest first.
- Ackermann, Peter M SC2012-07-06 → cancelled 2024-08-24
- Sasser, Brandon TN2026-04-17 active