Introduction to Networking Ports
The physical ports on a computer provides communication with peripheral devices like mouse, keyboard as well as internet devices via ethernet cables. Whereas, in computer networking a port is an endpoint to a logical connection. The port number shows category of the port. Ports are assigned as positive 16-bit unsigned integers, which range from 0 to 65535. E.g. Port 80 is used in HTTP traffic for example. Suppose, netstat -n command is fired on Linux or Windows, it will return a list of the local addresses and ports and the foreign addresses and port system is connected to.
Port Number Categories
Port number are divided into three categories.
- Well-known/System ports: Range 0–1,023
- Registered ports: Range 1,024–49,151
- Dynamic/Private ports: Range 49,152–65,535
Well-known ports also called as system ports ranges from 0 to 1023 since many of the core services on Unix servers used these ports, also it requires privilege permissions on the server for implementation.
Here is a detailed information about some of widely used ports.
|7||Echo||Echo server returns data is received on a originating source.|
|20||File Transfer Protocol (FTP)||Data Transfer.|
|21||File Transfer Protocol (FTP)||Command Control.|
|22||Secure Shell (SSH)||It manages network devices at the command level securely.|
|23||Telnet||Remote login service, unencrypted text messages.|
|25||Simple Mail Transfer Protocol (SMTP)||E-mail Routing. It is used to transfer email from source to destination between mail servers.|
|53||Domain Name System (DNS)||It converts domain names into IP addresses for network routing.|
|67-68||DHCP/BOOTP||It provides a connectionless service model with the help of User Datagram Protocol (UDP).|
|69||Trivial File Transfer Protocol (TFTP)||It transfers files without the session establishment.|
|70||Gopher||It provides gateways to other information systems such as World-Wide Web, WHOIS WAIS, archie, etc. It allows search and retrieve information from different locations easily.|
|80||Hypertext Transfer Protocol (HTTP)||It is a protocol for distributed, hypermedia, collaborative information systems.|
|110||Post Office Protocol (POP3)||Used by e-mail clients to retrieve e-mail from a server.|
|119||Network News Transfer Protocol (NNTP)||It helps to connect to Usenet servers and transfer newsgroup articles between systems.|
|123||Network Time Protocol (NTP)||It is used to synchronize the devices on the Internet.|
|137-139||NetBIOS||It is not a protocol but it is used in combination with IP with over TCP/IP (NBT) protocol. It helps to interconnect Microsoft Windows machines.|
|143||Internet Message Access Protocol 4 (IMAP4)||To Manage Digital Mail.|
|161-162||Simple Network Management Protocol (SNMP)||It is used by network administrators for network management.|
|179||BGP||It is used by ISP (Internet Service Provider) to maintain traffic processing and huge routing tables.|
|194||Internet Relay Chat (IRC)||It provides communication in the form of text in an easier way which is based on a client/server networking model.|
|389||LDAP||LDAP provides access and maintenance for distributed directory information. It is based on the ITU-T X.500 standard but it has been altered and simplified to work over TCP/IP networks.|
|443||HTTP Secure (HTTPS)||It provides same functions as HTTP but it uses a secure connection with the help of SSL or TLS.|
|636||Lightweight Directory Access Protocol over TLS/SSL (LDAPS)||LDAPS provides same functions as LDAP but it uses a secure connection with the help of SSLor TLS.|
|520||RIP||It uses hop count to find the best path between the source and the destination network.|
2. Registered Ports
These ports range from 1024 to 49151 are not controlled or assigned. However they can be registered to prevent redundancy.
3. Dynamic Ports
These ports range from 49152 to 65535 also known as private or non-reserved ports. These ports are not registered, assigned, or controlled. Dynamic ports are used for private or temporary ports.
Here is a list of some Registered and Dynamic ports.
|131||1 Dell OpenManage|
|1741||Cisco Works 2000|
|1755||MS Media Server|
|3724||World of Warcraft|
|28960||Call of Duty|
Conclusion – Networking Ports
Although it might seem obvious from this list that there are a large number of ports missing, the intention here was to cover only the most widely seen and used protocols. Hopefully this article will enable you to pick the right port number for such services to implement.
This is a guide to Networking Ports. Here we discuss the introduction to Networking Ports along with the 3 different categories respectively. You may also have a look at the following articles to learn more –