Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W3IFR callsign genealogy
Currently held by MAYO, JACK
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 W3IFR's current licensee, walking backwards.
- Mayo, DanielCAgranted 2020-09-11cancelled 2022-07-29
Successor callsigns
Callsigns held now by people who previously held W3IFR.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W3IFR, oldest first.
- MAYO, JACK PA1995-05-30 → cancelled 2007-05-31
- Mayo, Daniel CA2022-07-29 active