Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4SFP callsign genealogy
Currently held by Haun Jr, Robert A
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 W4SFP's current licensee, walking backwards.
- Haun Jr, Robert ANCgranted 2013-08-19cancelled 2013-09-07
Successor callsigns
Callsigns held now by people who previously held W4SFP.
No current licensee on record previously held this callsign.