Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WA4MOS callsign genealogy
Currently held by GROSS, DAVID 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 WA4MOS's current licensee, walking backwards.
- GROSS, DAVID PTXgranted 2015-07-16cancelled 2015-09-29
Successor callsigns
Callsigns held now by people who previously held WA4MOS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WA4MOS, oldest first.
- GROSS, DAVID P TX2002-03-07 → cancelled 2014-03-11
- GROSS, DAVID P TX2025-12-30 active