Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W1BTO callsign genealogy
Currently held by SWIFT, MICHAEL B
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 W1BTO's current licensee, walking backwards.
- SWIFT, MICHAEL BNHgranted 2004-04-19cancelled 2008-12-30
Successor callsigns
Callsigns held now by people who previously held W1BTO.
No current licensee on record previously held this callsign.