Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W4UNK callsign genealogy
Currently held by McMahon, Michael 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 W4UNK's current licensee, walking backwards.
- McMahon, Michael SSCgranted 2022-11-19cancelled 2022-12-09
Successor callsigns
Callsigns held now by people who previously held W4UNK.
No current licensee on record previously held this callsign.