Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K3COS callsign genealogy
Currently held by COSGROVE, MICHAEL 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 K3COS's current licensee, walking backwards.
- COSGROVE, MICHAEL PAZgranted 2023-08-17cancelled 2023-09-06
Successor callsigns
Callsigns held now by people who previously held K3COS.
No current licensee on record previously held this callsign.