Proxy Checker
Paste one proxy or a whole list. Per endpoint, the checker opens a real connection through the proxy to a public what-is-my-IP service and returns what the remote side sees: 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
Scheme prefix per line (http://, https://, socks4://, socks5://) overrides the menu above; Auto order: HTTP CONNECT, SOCKS5, SOCKS4. No response on the port: immediate fail, no per-protocol wait. Latency = full round trip via the proxy: connect, tunnel, TLS, one request to the lookup service. Carrier networks read higher than datacenters by design.
What a good result looks like
Expected on a mobile endpoint: ISP AT&T, T-Mobile or Verizon; city matching the purchased metro. Working US-carrier lines are marked "Working · mobile". Two runs under a held sticky session should return the same exit IP. HTTP fails, SOCKS5 passes: configure the tool for the SOCKS5 port.
Deeper checks
Use IPFighter's free tools alongside this checker for fingerprint, bot-detection and leak tests on the same connection:
IP score & lookup ↗ Browser fingerprint ↗ Bot detection ↗ DNS leak test ↗ WebRTC leak test ↗
Credentials: used for the check, never logged, never stored. Limits: 200 lines per run, four concurrent, 200 checks per address per ten minutes. Private and internal addresses are refused.
Prefer a desktop app? Download the Mobile Proxies US tester.