Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AF4SF callsign genealogy
Currently held by WALD, HARLAN I
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 AF4SF's current licensee, walking backwards.
- WALD, HARLAN IFLgranted 1998-01-29cancelled 2000-05-03
Successor callsigns
Callsigns held now by people who previously held AF4SF.
No current licensee on record previously held this callsign.