Network-level status, not just a web page check
Enter a domain or IP and this tool attempts a direct network connection to several common service ports - HTTP, HTTPS, FTP, SSH, SMTP, and MySQL - reporting which ones respond and how quickly. This is useful for diagnosing server issues beyond just "does the website load": a closed SSH port when you expect it open can point to a firewall problem, for example, separate from whether the web server itself is working.
Why checking multiple ports matters
A website can appear completely healthy on ports 80/443 while other services on the same server (FTP for file uploads, SMTP for outgoing mail, SSH for remote access) are silently unreachable - checking each port independently surfaces problems that a simple "is my website up" check would never reveal.
Why a closed port isn't automatically a problem
Many servers intentionally keep administrative ports like SSH, FTP, or MySQL closed to the public internet, or restricted to specific trusted IP addresses, as a deliberate security measure - seeing those report "closed" from this tool is often exactly the secure, expected configuration rather than a fault to fix.
What response time can tell you
The time an open port takes to respond gives a rough signal of network latency or server load between this checking service and the target - a port that's open but responds unusually slowly can point to network congestion or a server under heavy load, worth investigating further if it's consistently slow.