how to check if an ip address or proxy is working or not

How can I check if a specific ip address or proxy is aliv开发者_开发技巧e or dead

Because there may be any level of filtering or translation between you and the remote host, the only way to determine whether you can connect to a specific host is to actually try to connect. If the connection succeeds, then you can, else you can't.

Pinging isn't sufficient because ICMP ECHO requests may be blocked yet TCP connections might go through fine.

Maybe this question here will help, its about pinging in python.

Post

An IP address corresponds to a device. You can't "connect" to a device in the general sense. You can connect to services on the device identified by ports. So, you find the ip address and port of the proxy server you're interested in and then try connecting to it using a simple socket.connect. If it connects fine, you can alteast be sure that something is running on that port of that ip address. Then you go ahead and use it and if things are not as you expect, you can make further decisions.