Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KZ4XL callsign genealogy
Currently held by Hartnett, James R
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 KZ4XL's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KZ4XL.
No current licensee on record previously held this callsign.