Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W1SIR callsign genealogy
Currently held by Greene, Walter J
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 W1SIR's current licensee, walking backwards.
- Greene, Walter JCAgranted 2017-12-28cancelled 2019-04-05
Successor callsigns
Callsigns held now by people who previously held W1SIR.
No current licensee on record previously held this callsign.