Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W1DMH callsign genealogy
Currently held by Houston, Douglas 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 W1DMH's current licensee, walking backwards.
- Houston, Douglas MNHgranted 2009-10-20cancelled 2011-01-14
Successor callsigns
Callsigns held now by people who previously held W1DMH.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W1DMH, oldest first.
- GALVIN, FRANK J MA1994-07-15 → cancelled 2006-07-18
- Houston, Douglas M NH2020-12-30 active