Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W0MSM callsign genealogy
Currently held by MILLS, MARK S
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 W0MSM's current licensee, walking backwards.
- Mercurio, Matthew SMOgranted 2018-05-17cancelled 2018-06-05
Successor callsigns
Callsigns held now by people who previously held W0MSM.
- MILLS, MARK SMOgranted 2010-09-17cancelled 2011-07-19
All historical holders
Every license row we've seen with the callsign W0MSM, oldest first.
- MILLS, MARK S MO2010-03-30 → cancelled 2010-09-17
- Mercurio, Matthew S MO2018-06-05 active