Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KD4PIZ callsign genealogy
Currently held by HALES, MARK 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 KD4PIZ's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KD4PIZ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KD4PIZ, oldest first.
- HALES, MARK D CA2002-11-27 → cancelled 2014-06-10
- HALES, MARK D VA2026-03-07 active