Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W1SMM callsign genealogy
Currently held by McGrath, Sean 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 W1SMM's current licensee, walking backwards.
- McGrath, Sean MALgranted 2013-06-28cancelled 2013-07-19
Successor callsigns
Callsigns held now by people who previously held W1SMM.
No current licensee on record previously held this callsign.