Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W4YBO callsign genealogy
Currently held by WILEY, JOHN 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 W4YBO's current licensee, walking backwards.
- Wiley, John MTNgranted 2001-08-24cancelled 2008-03-25
Successor callsigns
Callsigns held now by people who previously held W4YBO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4YBO, oldest first.
- MORRISON, WALTER Z NC1998-05-12 → cancelled 1998-10-24
- WILEY, JOHN M TN2018-05-23 active