Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W9DTM callsign genealogy
Currently held by OHM, MERT L
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 W9DTM's current licensee, walking backwards.
- Madrid, Daryl TAZgranted 2012-05-11cancelled 2020-02-08
Successor callsigns
Callsigns held now by people who previously held W9DTM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W9DTM, oldest first.
- OHM, MERT L AR1994-07-16 → cancelled 2006-07-18
- Madrid, Daryl T AZ2020-02-08 active