Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4ISB callsign genealogy
Currently held by Swint, Michael T
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 W4ISB's current licensee, walking backwards.
- Swint, Michael TTNgranted 2019-11-26cancelled 2020-10-02
Successor callsigns
Callsigns held now by people who previously held W4ISB.
No current licensee on record previously held this callsign.