Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4LZR callsign genealogy
Currently held by BLACK, FRANK B
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 K4LZR's current licensee, walking backwards.
- RILEY, ROBERT JMSgranted 2015-04-20cancelled 2015-05-12
Successor callsigns
Callsigns held now by people who previously held K4LZR.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4LZR, oldest first.
- BLACK, FRANK B TN1996-11-19 → cancelled 2008-11-20
- RILEY, ROBERT J MS2025-04-25 active