Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W5IO callsign genealogy
Currently held by GUZICK, MORRIS
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 W5IO's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held W5IO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W5IO, oldest first.
- GUZICK, MORRIS TX1997-11-19 → cancelled 2004-07-06
- GUZICK, MAURY A TX2024-10-05 active