You must have heard the terms "Service Port" or "Port" in the past, especially if you have used a web hosting server. What do ports mean, and what are they used for? In this article, we will describe and provide you with the port numbers of the most commonly used services on cPanel servers.
What is Ports
Each computer connected to the internet distributes the services installed on it using a numeric port. Each service instance runs on a specific port, serving as a communication point between the client and the server. When you use a service from your personal computer to send email, for example, the program you use knows which port to use to send your message.
We can make an analogy like this, let's say you are going to make a crossing using a ferry. So each checkpoint has its own special role. One of them caters to cars, the other can accommodate motorbikes, and the third a Truck or Vehicle that carries certain loads. In short, each port has its own specific purpose.
TPC or UDP
Information is transmitted over the port using the TCP or UDP protocols.
TPC is much more reliable because it provides a proliferation of connection-based data. The way it works is that the two points are connected, and the data begins to flow without interruption. Disruption can occur ONLY if the connection between them is lost or one of the servers managing the link is lost.
UDP is a protocol that does not require a connection to be established. Information is sent from the remote server status. The downside is that no one knows if the data will reach its destination.
Another important difference between the two revolves around data streaming. TPC supports unlimited data transfer. There's not a bit of separation that results in a smooth viewing and listening experience. UPD streaming packages will definitely arrive, but they don't do it individually. The first packet sent can be received last, and the last packet can be received first, which will cause a severe discrepancy between the data collected and what you expect.
Hopefully this brief explanation of TCP and UDP has enlightened you on which protocol is better and can help you make a choice between the two.
Port Range Groups
The ports are separated into three groups. Each group contains ports, based on the services they tend to use. You can associate this group with how "famous" the service is running on a particular port.
- 0 - 1023: "Famous port numbers". They are usually occupied by the most used services, such as STMP, IMAP, MySQL, and Apache.
- 1024 - 49151: "Available port numbers". These ports can be assigned to companies that provide certain services.
- 49152 - 65536: "Up-for-grabs ports". Anyone can use the ports in this group.
cPanel Server Port Utilization
After discussing what ports represent and how information is transmitted over them - it's time to discuss the ports used by regular cPanel servers. Note that most of these ports correspond to the official ports used by the most famous services present on any machine or operating system:
- 21 - FTP service.
- 22 - SSH service.
- 25 - SMTP service.
- 53 - DNS service.
- 80 - HTTPD service.
- 110 - POP3 service.
- 143 - IMAP service.
- 443 - HTTPD service over SSL.
- 465 - SMTP service over SSL.
- 579 - cPhulk service.
- 587 - Exim service.
- 993 - IMAP service over SSL.
- 995 - POP3 service over SSL.
- 2525 - SMTP service. (Biasanya digunakan oleh perangkat mobile; Hp, tablet, dll)
- 2082 - cPanel service.
- 2083 - cPanel service over SSL.
- 2086 - WHM service.
- 2087 - WHM service over SSL.
- 2095 - Webmail service.
- 2096 - Webmail service over SSL.
- 3306 - MySQL service.
