Confidence: Medium · Source: FCC ULS · As of 2026-09-09
W1MSP callsign genealogy
Currently held by Petrou, Michael S
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 W1MSP's current licensee, walking backwards.
- Petrou, Michael SMAgranted 2012-10-01cancelled 2012-11-16
Successor callsigns
Callsigns held now by people who previously held W1MSP.
No current licensee on record previously held this callsign.