Ports are the buses which transfers data or information from server to user or from user to server. Here are some common ports a beginner should know to set his/her foot in the hacking Area.​
Port 20 FTP data (File Transfer Protocol)

Port 21 FTP (File Transfer Protocol)
Port 22 SSH
Port 23 Telnet
Port 25 SMTP (Simple Mail Transfer Protocol)
Port 53 DNS (Domain Name Service)
Port 68 DHCP (Dynamic host Configuration Protocol)
Port 79 Finger
Port 80 HTTP
Port 110 POP3 (Post Office Protocol, version 3)
Port 137 NetBIOS-ns
Port 138 NetBIOS-dgm
Port 139 NetBIOS
Port 143 IMAP (Internet Message Access Protocol)
Port 161 SNMP (Simple Network Management Protocol)
Port 194 IRC (Internet Relay Chat)
Port 220 IMAP3 (Internet Message Access Protocol 3)
Port 389 LDAP
Port 443 SSL (Secure Socket Layer)
Port 445 SMB (NetBIOS over TCP)

 

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