Paste addresses as IP:PORT, one per line. Each one is tested through a real request, and the protocol is worked out for you: we try HTTP, then SOCKS5, then SOCKS4, and report whichever answered. Results appear as they finish rather than all at the end.
Alive means the address completed a handshake and returned a page through itself at the moment you pressed the button. It says nothing about ten minutes from now. Free proxies drop out constantly, so a list worth using is a list checked shortly before use.
Dead covers several different failures at once: nothing listening on that port, a firewall dropping the packets, or a server that accepts the connection and then refuses to forward anything. For the purpose of using it, they are the same outcome.
Speed is one round trip from our machine in Frankfurt. Your own latency depends on where you sit, so a Singapore address that looks slow here may be the fastest thing on your list.
Anything you paste is tested and thrown away. We do not keep the list, and there is no account to create. See the privacy policy for what does get logged.
One run takes up to 100 addresses, with a fair daily allowance per visitor. That covers checking a list from the front page or a batch a colleague sent you.
Past that the maths changes. Checking thousands of addresses on a schedule is a job for your own tooling, and at that volume the free pool is rarely the bottleneck anyway: you spend more time discarding dead entries than working. People who scrape at that scale usually stop checking and start renting, either a paid proxy plan or, where a task is tied to a phone number or an account, a rotating mobile IP.
If a list from this site checks badly, it is probably old. Grab the most recent drop and try again.