Port Scanner
Check which common service ports are open on a host (safe predefined list only).
Only a fixed list of 15 common service ports is scanned. Full-range scanning is not supported.
About this tool
The Port Scanner attempts a TCP connection to a fixed list of common service ports on the target host and reports which accept connections. Covered ports include FTP (21), SSH (22), SMTP (25/465/587), DNS (53), HTTP (80), POP3 (110/995), IMAP (143/993), HTTPS (443), cPanel (2083), alternative SSH (2222) and alternative HTTPS (8443).
Only this predefined safe list is scanned — full-range scanning is intentionally not supported. Use the tool to verify a firewall change took effect, confirm a service is reachable from the public internet, or check that ports you intended to close really are closed.
Frequently asked questions
What does "closed" or "filtered" mean?
Closed means the host actively refused the connection — the machine is reachable but nothing listens on that port. A timeout usually means a firewall silently drops packets to that port (often called filtered).
Is it legal to scan a server?
Scanning systems you own or administer is fine, and this tool only probes a small list of standard ports. Avoid scanning third-party systems without permission, as some jurisdictions and providers treat unsolicited scanning as abuse.
Why is port 25 unreachable even though my mail server runs?
Many cloud and residential providers block outbound or inbound port 25 to fight spam. If 465/587 respond but 25 does not, a provider-level block is the most likely cause — check with your host.