Web Proxy Checker, as the name suggests, does exactly that. It is a free software utility with the following principle options and characteristics:
* Web Proxy Checker has support to check SOCKS4, SOCKS5, HTTP and HTTPS type proxies.
* It is built under multi-thread technology.
* Controller redirections.
* It lets you download a complete list of proxies from a given URL.
* Personalizable user agent.