Nástroj pro otestování otevřenosti specifikovaného portu na zadané IP adrese.
| 21 | FTP |
| 22 | SSH |
| 25 | SMTP |
| 53 | DNS |
| 80 | HTTP |
| 115 | SFTP |
| 143 | IMAP |
| 443 | HTTPS |
| 465 | SMTPS |
| 990 | FTPS |
| 993 | IMAPS |
| 1080 | SOCKS proxy |
| 1194 | OpenVPN |
| 3306 | MySQL |
| 5432 | PostgreSQL |
| 8080 | TOMCAT |
| 25565 | Minecraft |
| 27017 | MongoDB |