Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W9MPH callsign genealogy
Currently held by Haeberli, Martin P
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 W9MPH's current licensee, walking backwards.
- HAEBERLI, MARTIN PCAgranted 2002-04-15cancelled 2002-05-07
Successor callsigns
Callsigns held now by people who previously held W9MPH.
No current licensee on record previously held this callsign.