Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N4IPD callsign genealogy
Currently held by HATTER, FREDERICK J
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 N4IPD's current licensee, walking backwards.
- WARREN, ROBERT JCAgranted 2006-11-15cancelled 2016-07-15
Successor callsigns
Callsigns held now by people who previously held N4IPD.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N4IPD, oldest first.
- HATTER, FREDERICK J FL1997-11-14 → cancelled 2009-11-17
- WARREN, ROBERT J SC2026-05-02 active