Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K5RYU callsign genealogy
Currently held by Mascio, John R S
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 K5RYU's current licensee, walking backwards.
- Mascio, John R STXgranted 2007-06-13cancelled 2007-07-03
Successor callsigns
Callsigns held now by people who previously held K5RYU.
No current licensee on record previously held this callsign.