Know your Computer Ports

by Jo Escotal on April 25th, 2010

PORTS

PORTS - In TCP/IP and UDP networks, a port is an endpoint to a logical connection and the way a client program specifies a specific server program on a computer in a network.

Some ports have numbers that are pre-assigned to them by the IANA (Internet Assigned Numbers Authority), and these are known as well-known ports (specified in RFC 1700).

Port numbers range from 0 to 65536, but only ports numbers 0 to 1024 are reserved for privileged services and designated as well-known ports. This list of well-known port numbers specifies the port used by the server process as its contact port.

WELL KNOWN PORT Numbers


20/21                FTP
22                    SSH
23                    Telnet
25                    SMTP
53                    DNS
67/68               BOOTP
69                    TFTP
80                    HTTP
88                    Kerberos
110                  POP3
119                  NNTP
123                  NTP
143                  IMAP
161                  SNMP
389                  LDAP
443                  SSL
546/547            DHCP
1512                WINS
1701                L2TP
1723                PPTP
1812/13            RADIUS
3389                RDP

If you have any questions about computer ports email me at jescotal@microtrain.net

Jo Blitz Escotal
CEO
Escotal.com

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