Confidence: Medium · Source: FCC ULS · As of 2026-09-11
KB4YYZ callsign genealogy
Currently held by Blocker, David C
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 KB4YYZ's current licensee, walking backwards.
- Blocker, David CTXgranted 2017-09-12cancelled 2017-10-03
Successor callsigns
Callsigns held now by people who previously held KB4YYZ.
No current licensee on record previously held this callsign.