A port is logical access channel between two devices which help in their communication . A port is used to transfer the data
There are total 65535 ports
Important port
1.Well-known ports 2.Registered port of interest
port use Port use
20-21 FTP 1080 Socks5
22 SSH 1241 Nessus Server
23 Telnet 1433,1434 SQL Server
25 SMTP 1494,2598 Citrix Application
42 WINS 1521 Oracle Listener
53 DNS 2512,2513 Citrix Management
80,8080 HTTP 3389 RDP
88 Kerberos 6662-6667 IRC
110 POP3
111 PortMapper-Linux
123 NTP
135 RPC-DCOM
139 SMB
143 IMAP
161,162 SNMP
389 LDAP
445 CIFS
514 Syslog
636 Secure LDAP
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