The network diagnostics tool helps you quickly check whether a host is reachable, how responsive it is, and whether common web ports are available. It is useful for system administrators, developers, and anyone troubleshooting basic connectivity issues before going deeper.
Use it to resolve a hostname to an IP address, test HTTP and HTTPS reachability, measure latency across multiple attempts, and get a short interpretation of the result. It is designed for fast browser-based diagnostics with a clean summary and technical details when needed.
Interpretation
Raw diagnostics
How to use
- Enter a hostname or IP address, such as
google.comor1.1.1.1. - Click Diagnose to start the checks.
- Review the summary cards for reachability, average latency, jitter, and port status.
- Check the connectivity section to see per-port results and attempt details.
- Read the interpretation block for a quick explanation of the overall result.
- Expand raw diagnostics only when you need the technical output for troubleshooting or sharing.
FAQ
Network diagnostics help
This tool resolves the target host to an IP address, tests HTTP response time on ports 80 and 443 across multiple attempts, and shows a summary with status, average response time, jitter, and a short interpretation of the result.
Healthy means port 443 is reachable with an acceptable response time. Degraded means the target is reachable but the response time is higher than expected. Unreachable means no successful attempts were recorded on either port.
Many websites redirect all traffic to HTTPS or do not serve plain HTTP at all. In that case, port 443 is reachable while port 80 appears unavailable or blocked. This is normal and does not affect the status result.
This tool measures HTTP response time from your browser to the target host, not ICMP ping. The result includes DNS resolution, TCP handshake, TLS negotiation, and the first server response. Values between 300ms and 800ms are common for hosts outside your region and are still considered healthy.
Not in the current version. This tool is focused on web reachability checks for ports 80 and 443. Broader service-port diagnostics would require a server-side implementation.
Browser restrictions, CORS policies, redirects, DNS issues, or temporary network filtering can affect the result. Use the raw diagnostics and attempt table to understand what happened during the checks.
Practical examples
Example 1: You want to check whether a public website is reachable over HTTPS. Enter the domain, run the diagnostic, and confirm that port 443 is reachable with acceptable latency.
Example 2: A site loads slowly for users. Run the tool against the hostname and compare the average latency and jitter values to see whether the connection looks stable or degraded.
Example 3: A target works in the browser but fails on plain HTTP. The tool can quickly show whether port 80 is unavailable while 443 is still reachable.
Useful links
Other tools
- DNS lookup — check A, AAAA, MX, TXT, CNAME, NS, and other record types.
- My IP and network info — inspect your public IP, ISP, country, and connection details.
- IP subnet calculator — calculate subnet ranges, masks, hosts, and allocation details.
- Curl converter — convert curl commands into Fetch API, Axios, and PowerShell snippets.