Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AI4PY callsign genealogy
Currently held by Frost, William R
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 AI4PY's current licensee, walking backwards.
- Stewart, ArchHIgranted 2014-05-28cancelled 2015-04-17
- Stewart, ArchHIgranted 2013-04-02cancelled 2014-05-28
- Linford, TonyORgranted 2021-04-23
- Linford, TonyORgranted 2021-02-24cancelled 2021-04-23
- Linford, TonyORgranted 2021-02-24cancelled 2021-03-31
Successor callsigns
Callsigns held now by people who previously held AI4PY.
No current licensee on record previously held this callsign.