Test your system before others do! A port scan allows you to determine which services are also reachable outside of your local network. Computers which use a router with NAT (Network Address Translation) to connect to the Internet can usually not be accessed outside of the local network. However, the ports can be redirected from the router to the specific computer by using port forwarding. The portscanner lets you verify if this redirection works properly.
A single port can be verified by using the following format: 208.80.152.2:4444 (The port is separated from the IP address by a colon).
Some system administrators consider portscans as attacks on their system. By carrying out the test you therefore certify to be authorized to scan the target system and take note that we are allowed to save the corresponding connection data. The portscan tests the 25 ports listed below.
| 21 | "FTP"-Port. Will be used to transfer data through ftp. |
|---|---|
| 22 | "SSH"-Port. Will be used to connect a Secure Shell. |
| 23 | "Telnet"-Port. Will be used for terminal emulation. |
| 25 | "SMTP"-Port. Will be used for email delivery (see also port 465). |
| 53 | "DNS"-Port. Will be used to resolve domain names into ip addresses. |
| 79 | "Finger"-Port. Will be used to show informations about a user. |
| 80 | "HTTP"-Port. Will be used to communicate with the webserver. |
| 110 | "POP3"-Port. Will be used by clients to connect to an email server. |
| 115 | "SFTP"-Port. Will be used by "Simple File Transfer Protocol" to transfer files. |
| 135 | "RPC"-Port. Will be used by Remote Procedure Calls. |
| 139 | "NetBIOS"-Port. Will be used by Netbios (Network Basic Input Output System). |
| 143 | "IMAP"-Port. Will be used to access and manage mailboxes. |
| 194 | "IRC"-Port. Will be used to access IMAP mailboxes. |
| 389 | "LDAP"-Port. Will be used for querying and modifying directory services. |
| 443 | "HTTPS"-Port. Will be used for Hypertext Transfer Protocol over Secure Socket Layer. |
| 445 | "SMB"-Port. Will be used to provide shared access to files and printers. |
| 465 | "SMTPS"-Port. Will be used for secured mail transfer. |
| 1433 | "MS SQL"-Port. Will be used to communicate with a SQL server. |
| 1723 | "PPTP"-Port. Will be used for Point-to-Point Tunneling (VPN). |
| 3306 | "MySQL"-Port. Will be used to access MySQL databases. |
| 3389 | "Remote Desktop"-Port. Will be used by Windows Remotedesktop. |
| 5632 | "pcAnywhere"-Port. Will be used to remote access a machine through pcANYWHERE. |
| 5900 | "VNC"-Port. Will be used by Virtual Network Computing to share desktops. |
| 6112 | "Warcraft III"-Port. Will be used by Warcraft III to host network games. |
| 8080 | "HTTP-Alt"-Port. Will be used by Proxy and Caching Servers. |