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COMMON WELL-KNOWN PORTS are--
Service Port Function
_________________________________
HTTP 80 Web
HTTPS 443 Web (secure)
FTP 20,21 File transfer
SFTP 22 File transfer (secure)
FTPS 989,990 File transfer (secure)
SIP 5060 VoIP (Internet phone)
DNS 53 Find IP address
SMTP 25 Internet mail
POP3 110 POP mailbox
IMAP 143 IMAP mailbox
Telnet 23 Remote login
SSH 22 Remote login (secure)
NNTP 119 Usenet newsgroups
NNTPS 563 Usenet (secure)
IRC 194 Chat
NTP 123 Network time of day
SNMP 161,162 Network management
CMIP 163,164 Network management
Syslog 514 Event logging
Kerberos 88 Authentication
NetBIOS 137-139 DOS/Windows naming