Common Ports

In: Computers and Technology

Submitted By tazeyed
Words 349
Pages 2
Common Ports
Network ports are logical connections, provided by the TCP or UDP protocols at the Transport layer, for use by protocols in the upper layers of the OSI model. The TCP/IP protocol stack uses port numbers to determine what protocol incoming traffic should be directed to. Some characteristics of ports are listed below: • Ports allow a single host with a single IP address to run network services. Each port number identifies a distinct service. • Each host can have over 65,000 ports per IP address. • Port use is regulated by the Internet Corporation for Assigning Names and Numbers (ICANN). ICANN specifies three categories for ports. • Well known ports range from 0 to 1023 and are assigned to common protocols and services. • Registered ports range from 1024 to 49151 and are assigned by ICANN to a specific service. • Dynamic (also called private or high) ports range from 49,152 to 65,535 and can be used by any service on an ad hoc basis. Ports are assigned when a session is established, and released when the session ends.
The following table lists the well known ports that correspond to common Internet services.
|Port(s) |Service |
|20 TCP |File Transfer Protocol (FTP) |
|21 TCP | |
|22 TCP and UDP |Secure Shell (SSH) |
|23 TCP |Telnet |
|25 TCP |Simple Mail Transfer Protocol (SMTP) |
|53 TCP and UDP |Domain Name Server (DNS) |
|67 UDP |Dynamic Host Configuration Protocol (DHCP)…...

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