Following table lists some well known ports that could be open on your machine. Any user on the Internet can connect to your machine through these ports. Read the description next to each port for any potential vulnerability associated with it.

Check for a custom port:

FTP (TCP/21): Closed

Telnet (TCP/23): Closed

SMTP (TCP/25): Closed

DNS (TCP/53): Closed

HTTP (TCP/80): Closed

POP3 (TCP/110): Closed

RPC (TCP/135) Closed

NetBIOS Session Services (TCP/139): Closed

Active Directory/LDAP (TCP/389): Closed

SMB (TCP/445): Closed

MSSQL (TCP/1433): Closed

Oracle (TCP/1521) Closed

Microsoft Global Catalog (TCP/3268): Closed

Remote Desktop (TCP/3389) Closed

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