Il servizio Portscan serve a trovare le porte aperte di un host remoto e quindi a verificare la sicurezza dell'host stesso.
Per motivi di sicurezza potrete scannare solo le porte del vostro pc

The Portscan service can be used to trace the open ports on a remote host thus proofing its level of security.
For privacy reasons, you can only scan your own system ports
SCANSIONE PORTA SINGOLA SUL TUO PC (18.206.16.123)
SINGLE PORT PORTSCAN (18.206.16.123)
port:


SCANSIONE PORTE STANDARD SUL TUO PC (18.206.16.123)
STANDARD PORTS PORTSCAN (18.206.16.123)
port 20 ( FTP Data ) port 80 ( HTTP ) port 1080 ( Socks )
port 21 ( FTP ) port 110 ( POP3 ) port 4662 ( Emule TCP )
port 22 ( SSH ) porta 113 ( IDENT ) port 4672 ( Emule UDP )
port 23 ( Telnet ) port 135 ( RPC ) port 5000 ( UPnP )
port 25 ( SMTP ) port 139 ( NetBIOS ) port 5900 ( VNC )
port 53 ( DNS ) port 143 ( IMAP ) port 8080 ( WebProxy )
port 59 ( DCC ) port 443 ( HTTPS )  



Guarda la lista completa delle porte (IANA.org)