Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AI4SP callsign genealogy
Currently held by Welch, Walter L
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 AI4SP's current licensee, walking backwards.
- Welch, Walter LKYgranted 2006-06-19cancelled 2006-11-28
Successor callsigns
Callsigns held now by people who previously held AI4SP.
No current licensee on record previously held this callsign.