Check port reachability

Enter a hostname, select the ports to check, and get real TCP connection results from the Cloudflare edge — requires the Portpeek backend API to be deployed.

Ports to check
(added automatically)
checking...
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Platform limits

  • Port 25 is not allowed. Outbound SMTP is blocked on this platform; a check would always fail misleadingly.
  • Port 443 uses TLS. The measured latency includes the TLS handshake, not just the TCP handshake.
  • Hosts behind Cloudflare may appear unreachable. The Cloudflare Worker cannot open a TCP socket to a host that is itself behind Cloudflare. The result reads as TIMED OUT — that is a platform limitation, not a result about your system.
  • 10-second timeout per port. No response within 10 seconds = TIMED OUT with no latency.
  • This is a reachability check, not a port scanner. Only check the hosts and ports you own or have permission to test.