Ping any public host and measure packet loss plus min/avg/max round-trip latency.
Uses real ICMP ping when the server allows it. Many sandboxed hosts block ICMP, so the API honestly falls back to TCP-connect latency on ports 443/80 — labelled 'TCP fallback' in the result badge. Loss and timings are shown either way.
google.com → 0% loss, avg 12 msWhen ICMP is unavailable, latency is measured by opening TCP connections to ports 443/80. It is honest latency data, just not true ICMP.
The host is down, firewalled, or ignoring ping. Try the HTTP header checker to see if its web port answers.
Private and internal addresses are refused (403). Only public hosts can be pinged.