Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N4SDH callsign genealogy
Currently held by LONGSWORTH, LAWRENCE D
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 N4SDH's current licensee, walking backwards.
- HANCOCK, SANDY DTNgranted 2017-07-25cancelled 2021-12-31
Successor callsigns
Callsigns held now by people who previously held N4SDH.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N4SDH, oldest first.
- LONGSWORTH, LAWRENCE D AL2004-02-13 → cancelled 2016-02-17
- HANCOCK, SANDY D TN2021-12-31 active