Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W9COS callsign genealogy
Currently held by COSS, CHRIS L
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 W9COS's current licensee, walking backwards.
- COSS, CHRIS Lcancelled 1999-04-21
Successor callsigns
Callsigns held now by people who previously held W9COS.
No current licensee on record previously held this callsign.