Port checker
Port Checker
Useful for quick troubleshooting: is the service reachable, filtered, or refusing connections?
Host 443 Ready
HostDomain or IP
Port1 to 65535
Status
—
Checked at: —
Address used
—
Resolved: —
Latency
—
Timeout: —
Raw response (JSON)
How to use it
- Enter a host name (example: example.com).
- Enter a port (example: 443).
- Click Check port to see whether it is reachable.
Common ports to check
These are popular TCP ports and what they usually run. Defaults vary by setup.
PortService
:443HTTPS — Secure web apps and APIs
:80HTTP — Web apps (often redirects to HTTPS)
:22SSH — Remote login / server management
:3389RDP — Remote Desktop (Windows)
:21FTP — Legacy file transfer (control)
:25SMTP — Mail server to server
:587SMTP (submission) — Sending mail from apps/clients
:3306MySQL — Database
:5432PostgreSQL — Database
:6379Redis — Cache / queue
:27017MongoDB — Database
:8080HTTP (alt) — Common dev/proxy port
Result guide
- Open: a service accepted a TCP connection.
- Closed: the host refused the connection (no listener).
- No response: could be filtered by a firewall, or the host is unreachable.
Good to know
- Results depend on where this server runs (it is not a check “from your computer”).
- For safety, local/private networks are blocked (like 127.0.0.1 and 192.168.x.x).
- This checks TCP connectivity only (not HTTP status codes).
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