Free online proxy checker
Paste a list of proxies in IP:PORT or IP:PORT:USER:PASS format and check whether each one works, how fast it responds and what it reveals about you. It supports HTTP and SOCKS5.
How to check a proxy
Paste up to 5 proxies, one per line, as IP:PORT or IP:PORT:USER:PASS. The checker tries HTTP and then SOCKS5 and reports whether the proxy answered, how long it took and whether it hides your address.
A failed check is reported as unreachable. The tool does not tell you whether a port refused the connection or timed out.