Online Ping Test (TCP)

About Ping (TCP)

This is not ICMP ping. It opens a TCP connection to a port you choose — 443 by default — measures how long the handshake takes, closes it, and repeats. Up to ten probes, then minimum, average, maximum and loss are reported.

TCP is the right measurement for most services anyway. ICMP is frequently rate-limited or blocked entirely by cloud providers, so a host that “does not respond to ping” may still answer TCP instantly — and TCP timing includes the path a real client actually takes.

Where it helps

• Works against hosts that block ICMP, which includes most cloud infrastructure.
• Measures connection setup on the port your service actually uses.
• Reports minimum, average, maximum and loss across the run.
• Plots every round as a line, so a single slow probe is told apart from a connection that is steadily slow.
• Probing from the server gives you an outside view of latency, not your own Wi-Fi's.

Limits

• Latency is measured from this application's server, not from your location or your users'.
• TCP handshake timing runs slightly higher than ICMP round-trip time; compare like with like.
• Maximum ten probes with a three-second timeout each, so it samples rather than monitors.
• A closed port produces failures that look like packet loss but are not.

Frequently asked questions

Why TCP instead of ICMP?

Cloud providers routinely block or throttle ICMP, so it produces misleading results. A TCP connection to the real service port measures what users experience.

The latency here is much better than mine. Why?

The probe starts from a datacentre with a short, well-peered path. Your own route, Wi-Fi and VPN add most of the difference.

Why do I get 100% loss when the site clearly works?

Check the port. The default is 443; a service on 80, 8443 or something else will refuse every probe.

Can I use this for monitoring?

No — it is a spot check limited to ten probes. Continuous monitoring needs a service that samples on a schedule and alerts.

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