If we want to check which are the ports open for a website, try following website http://en.dnstools.ch/port-scan.html
on this website, type the website / IP to which you want to see ports opened and click “Scan” and it shows the result as open / closed ports.
If we want to check what is the IP address of your machine using online tool, use the following website, http://en.dnstools.ch/show-my-ip.html
and it will show you what the the current public IP assigned to your PC.
If you wan to see whether you can ping some machine / server / website, you can use below website, http://en.dnstools.ch/online-ping.html
type your domain / IP and click “Ping” to see whether it pings or not.