Get your IPv4 or IPv6 address and test what IP version your system prefer to use when connecting to website that support both IPv4 and IPv6.
Internet uptime logger is a tool that shows a heatmap of a number of internet disconnections for a given date and time.
PingPorts is an online tool for checking open ports on your IP address. This tool helps you to verify that the port is open and can be used for incoming connections.