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Higher-level applications that use TCP/IP like
Web protocol and hypertext transfer protocol (HTTP) use
well known ports
To which numbers have been assigned by the Internet Assigned Numbers Authority (IANA)
Allowable port numbers
Range from 0 to 65535
the well-known ports
Ports 0 to 1023
Port numbers are divided into three ranges
The well-known ports, the registered ports and the dynamic and/or
The registered ports
1024 through 49151
The dynamic and/or private ports
49152 through 65535
Port 7
Echo - TCP/UDP
Port 19
chargen - TCP
Port 20-21
FTP - TCP
Port 23
Telnet - TCP
Port 25
STMP - TCP
Port 43
Whois- TCP/UDP
Port 53
DNS - TCP
Port 69
TFTP - UDP