Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K5ZMB callsign genealogy
Currently held by Spencer, Cale M
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 K5ZMB's current licensee, walking backwards.
- Spencer, Cale MTXgranted 2013-07-11cancelled 2013-10-17
Successor callsigns
Callsigns held now by people who previously held K5ZMB.
No current licensee on record previously held this callsign.