Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB5ZAD callsign genealogy
Currently held by GUZMAN, GUILLERMO A
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 KB5ZAD's current licensee, walking backwards.
- GUZMAN, GUILLERMO ATXgranted 2008-01-17cancelled 2008-02-05
Successor callsigns
Callsigns held now by people who previously held KB5ZAD.
- GUZMAN, GUILLERMo ATXgranted 2018-05-22
All historical holders
Every license row we've seen with the callsign KB5ZAD, oldest first.
- GUZMAN, GUILLERMO A TX1993-03-02 → cancelled 2005-03-03
- GUZMAN, GUILLERMO A TX2008-02-05 → cancelled 2008-07-22