Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W9CMP callsign genealogy
Currently held by PIETRZAK JR, CARL M
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 W9CMP's current licensee, walking backwards.
- PIETRZAK JR, CARL MILgranted 2018-07-02cancelled 2018-07-21
Successor callsigns
Callsigns held now by people who previously held W9CMP.
No current licensee on record previously held this callsign.