Proxy checker
We don't store proxies or passwords.
How we check a proxy
We connect to the proxy from our server and request a page on our site through it over HTTPS. This tells us whether it works, the exit IP websites see, and the time from the start of the connection until the response arrives. That time is measured from our server, so it may differ from the time measured from your device. If a line does not start with a type such as socks5:// and you have not chosen a type, we try HTTP, then SOCKS5.
For HTTP and HTTPS proxies we request a second, unencrypted page and read the headers the proxy added. “Transparent” means it sent its user's IP address in a header such as X-Forwarded-For. “Anonymous” means it announced that it is a proxy in a header such as Via, without the address. “Elite” means it added nothing. SOCKS passes data through as is and cannot add headers. “Unknown” appears when the unencrypted page does not complete.
“Type does not match the proxy” usually means you chose HTTP for a SOCKS proxy, or the reverse. We do not check private addresses or port 25. For what makes a proxy good beyond simply working, read Proxy quality: what decides it and how to measure it.
Do you keep the proxy or the password?
No. We use them for this check only. We do not log them or return them in the result.
Why does the proxy work for me but fail the check?
Some proxies accept connections only from preset addresses or from certain countries, and our server's address is not among them. Try authenticating with a username and password if your provider supports it.
What is the difference between HTTP, HTTPS and SOCKS5 here?
An HTTP proxy accepts web requests and CONNECT requests. HTTPS works the same way, but the connection to the proxy itself is encrypted with TLS. SOCKS4 and SOCKS5 carry any TCP connection, and SOCKS5 supports a username and password.
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