Port Number is considered as an communication endpoint in a system. Ports uniquely identify different applications. It is a 16-bit unsigned integer, ranging from 1 to 65535.
Some of them are listed here:
Netstat 15 FTP 21 SSH 22 Telnet 23 SMTP 25 Time 37 RAP 38 WINS 42 DNS 53 Bootp 67 DHCP 68 TFTP 69 FINGER 79 HTTP 80 Kerberos 88 HOSTNAME 101 POP2 109 POP3 110 NNTP 119 NTP 123 Net BIOS 139 IMAP4 143 RPC 135 SNMP 161 BGP 179 RIS 180 LDAP 389 SQL Server 1433 NFS 2049 IMAP3 220 LDAP (Lightweight Directory Access Protocol) 389 HTTPS (HTTP over SSL/TLS) 443 Terminal services 3389
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