Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4SBL callsign genealogy
Currently held by SANIBEL EMERGENCY RADIO UNIT
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 W4SBL's current licensee, walking backwards.
- KF4LQLcancelledSANIBEL EMERGENCY RADIO UNITFLgranted 1996-08-22cancelled 2003-06-10
Successor callsigns
Callsigns held now by people who previously held W4SBL.
No current licensee on record previously held this callsign.