The extension for the Google Chrome browser allows you to check the availability of the port on your network device without accessing the site from the browser.
To install the extension you need:
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FTP Control | 21 |
SSH | 22 |
Telnet | 23 |
SMTP | 25 |
DNS | 53 |
HTTP / Web | 80 |
POP3 | 110 |
IMAP | 143 |
HTTPS | 443 |
IMAP SSL | 993 |
POP3 SSL | 995 |
MSSQL | 1433 |
REMOTE | 3389 |
VNC | 5900 |