Proxy Checker
Paste one proxy or a whole list. Each line gets a real connection through the proxy to a public what-is-my-IP service. You get what the far end saw: exit IP, city, ISP, ASN and round-trip time. Then export the ones that work.
| # | Proxy | Status | Protocol | Latency | Exit IP | Location | ISP / ASN |
|---|
How the check works
Start a line with a scheme (http://, https://, socks4://, socks5://) and that line uses that protocol. No scheme means the menu above picks, and Auto goes HTTP CONNECT, SOCKS5, SOCKS4, in that order. A port with no answer at all fails the line immediately, with no wait on each protocol. Latency counts the whole trip through the proxy: connect, tunnel, TLS, one request to the lookup service. A carrier network reads higher than a datacenter, by design.
What a good result looks like
Look for AT&T, T-Mobile or Verizon as ISP on a mobile line, and the metro you bought as the city. A working line on a US carrier gets the "Working · mobile" mark. Hold a sticky session, run the list a second time, and the exit IP should not change. When SOCKS5 connects and HTTP does not, your tool just needs the SOCKS5 port.
Deeper checks
Run fingerprint, bot-detection and leak tests on that connection with IPFighter's free tools, a good match for this checker:
IP score & lookup ↗ Browser fingerprint ↗ Bot detection ↗ DNS leak test ↗ WebRTC leak test ↗
We use credentials to run the check. We never log or store them. Each run takes up to 200 lines, four at a time. Each address gets up to 200 checks per ten minutes. Private and internal addresses are refused.
Prefer a desktop app? Download the USA 5G Proxies tester.