What this tool does
VM APIPublic target
- Open or filtered TCP port.
- Ping limited to public targets.
- Availability and latency.
Privacy
Local tools run in the browser. API modules query only public targets and block private networks.
Public network tests
Test a TCP port, run server-side ping, measure repeated availability and compare HTTP latency for public services.
Quick guide
TCP port vs ping
An open TCP port proves that a service accepts a connection on that port. Ping usually confirms ICMP or system-level response, which may be blocked.
Possible results
Open means the TCP connection succeeded. Closed or filtered may indicate a firewall, stopped service, or non-exposed port.
Fair use
Test only public targets you own or are authorized to check.
Frequently asked questions
Why does port 443 answer but not port 80?
HTTPS may be exposed while HTTP is disabled, redirected elsewhere or blocked by a firewall.
Does a closed port mean the server is offline?
Not necessarily. The server may be online with that port blocked or no service attached.
Can the test see my LAN?
No. Private, loopback, reserved IPs and local domains are blocked server-side.