IPTools UK

Ping Check

Test reachability and latency to a host with a TCP-based ping — reports round-trip time and packet loss over several attempts.

About this tool

This tool sends four TCP connection attempts to the host and port you specify and reports how long each one took, along with minimum, average, maximum and jitter figures — the same statistics a traditional command-line ping reports, measured over TCP instead of ICMP.

TCP-based, not ICMP

Cloudflare Workers cannot send raw ICMP packets, so this measures TCP connection time to a chosen port rather than a traditional ping. See the FAQ below for why.

How to use this tool

  1. Enter a hostname or IP address.
  2. Optionally change the port (defaults to 443/HTTPS).
  3. Select "Ping".

Frequently asked questions

Why doesn't this send a real ICMP ping?
Cloudflare Workers — the platform this site runs on — has no access to raw sockets, so it cannot construct or send ICMP echo request packets. This is the same restriction web browsers operate under, which is why virtually every browser-based "ping" tool, including this one, measures TCP connection time to a specific port instead. It is a genuinely useful proxy for reachability and latency, just not identical to traditional ICMP ping.
Why does it test a port rather than just the host?
A TCP connection attempt has to be aimed at a specific port. Port 443 (HTTPS) is used by default since almost every server has something listening there, but you can test any other port your service uses.
How does pinging port 443 or 80 actually work?
Cloudflare Workers doesn't permit raw TCP connections to ports 80 or 443 — it requires HTTP(S) traffic on those ports to go through a normal HTTP request instead. So for those two ports only, each "ping" is timed as an HTTP HEAD request rather than a raw socket connection. Every other port uses a real TCP connection.
What is "jitter" (mdev)?
Jitter is the variation in response time between attempts. Low, consistent latency (low jitter) generally makes for a smoother experience for real-time traffic such as video calls or gaming than the same average latency with high jitter.

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