RefCheck.Radio sends UDP connection packets to each reflector registered on DVRef.com for each mode, every ~30 minutes. The timeout is 5 seconds; the service attempts the connection twice before listing a reflector as unavailable. The page auto-refreshes to reflect the latest data.
Each reflector's IP is also checked against commercial hosting provider ranges: ✓ indicates a commercial/hosting IP, ✗ indicates a home/residential IP.
This is not a "wall of shame" -- it is a resource for both reflector users and operators to help make Digital Voice for Amateur Radio a Better Place™. 💙