Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W3ISI callsign genealogy
Currently held by RUSH, MARK F
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 W3ISI's current licensee, walking backwards.
- RUSH, MARK FPAgranted 1998-12-09cancelled 1999-11-13
Successor callsigns
Callsigns held now by people who previously held W3ISI.
No current licensee on record previously held this callsign.