People who are into coding or website development, usually come access the IP address 127.0.0.1. Networking people often see this. For newbies, the 127.0.0.1 IP address looks strange. So, they usually search for what exactly is 127.0.0.1. In this detailed guide, I will explain the 127.0.0.1 IP address, its importance, and how it works.
Before I talk about 127.0.0.1, you need to understand the basics of IP address. An IP address is a unique string of numbers that is assigned to each device connected to the network. It is like the mailing address of the device. Signals use this address to reach the device.
There are mainly two types of IP addresses
- Public IP Addresses: These are assigned by your ISPs and are visible to the internet. When you visit websites, send emails, or access services, your Public IP address is used.
- Private IP Addresses: These are used within a private network for communication between devices connected to the private network.
Now let’s come to 127.0.0.1 which is a special type of IP address.
Also read: IP Address Classes: A Beginner’s Guide
What Is 127.0.0.1?
The IP address 127.0.0.1 is known as the loopback address. It refers to the self in all devices. In simple terms, when a device tries to contact the IP address 127.0.0.1, it is contacting itself. Your request for a 127.0.0.1 IP address never leaves the device.
The IP address 127.0.0.1 is also referred to as “localhost” because localhost is the domain that prints to 127.0.0.1 on a system. When you type http://localhost on your web browser, it tries to connect to the IP address 127.0.0.1.
Web developers mainly use it while developing a website or application. They run a web server on a local machine and access it using the IP address 127.0.0.1 to open their website locally.
It is also important to note that 127.0.0.1 is not the only IP address that is a loopback address. The entire 127.x.x.x range (127.0.0.0 to 127.255.255.255) is reserved for loopback. But most people only use 127.0.0.1 because it is set as default for localhost.
So next time you see 127.0.0.1 or localhost anywhere, you know what it is referring to.
