PORT CHECKER FAQ:
What is port in Internet?
Imagine an apartment building. The building itself has an address, like an IP address on the internet. But inside that building, there are many apartments, each with its own door.
In the world of internet traffic, a port acts like the unique identifier for an apartment within a building (the IP address). Ports are virtual numbers that help direct incoming traffic to the specific service or program running on a device.
Here's a breakdown of how it works:
IP Address: This acts like the building address. It identifies a specific device on the internet.
Port Number: This acts like the apartment number. It identifies a specific service or program running on that device.
So, together, the IP address and port number pinpoint the exact destination for incoming data traffic. This allows different programs on a single device to receive their own data streams. For instance, emails might be delivered on port 25, while web traffic arrives on port 80.
There are thousands of port numbers, some with predefined purposes. For example, port 443 is commonly used for secure communication (HTTPS), while port 21 is used for FTP file transfers.
Here are some common ports you'll encounter on the internet:
Port 20 & 21: File Transfer Protocol (FTP) - Used for transferring files between devices.
Port 22: Secure Shell (SSH) - Provides secure remote access to a computer system.
Port 25: Simple Mail Transfer Protocol (SMTP) - Traditionally used for sending emails (though secure alternatives are becoming more common).
Port 53: Domain Name System (DNS) - Translates domain names into IP addresses.
Port 80: Hypertext Transfer Protocol (HTTP) - The foundation of communication for web browsing (though HTTPS is preferred for security).
Port 123: Network Time Protocol (NTP) - Synchronizes clocks across computer networks.
Port 179: Border Gateway Protocol (BGP) - Routes internet traffic between networks.
Port 443: HTTP Secure (HTTPS) - The secure version of HTTP, used for encrypted communication on websites.
Port 587: Secure SMTP - A secure alternative to port 25 for sending emails.
Port 3389: Remote Desktop Protocol (RDP) - Allows remote access to a graphical desktop interface.
This is just a small sampling of common ports. There are many others used for various services and applications. You can find more comprehensive lists by searching on Google for "common port numbers" online.
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