Localhost: What it is and How it works?


Although localhost is sometimes used as synonymous with package programs such as WAMP, XAMPP, or EasyPHP, this is also an incorrect definition. These programs broadcast using localhost as well as with other IP addresses defined on the computer.

The term Localhost refers to the computer on which a program is running. It is a loopback device that is assigned IP Address in IPv4 (::1 for IPv6) and used to enable the computer to access it over TCP/IP.

Being able to communicate with the current machine as if it were communicating with a remote machine is useful for testing purposes, as well as for using features located on the current machine, but which are expected to be remote.

After briefly explaining what is localhost, what it means, I am going to provide detailed information and working logic that will clarify the definition.

Let’s talk about IP addresses

The IP (Internet Protocol) address is generally an address that indicates the place where a certain piece of equipment is located, which are usually computers.

In private networks, each computer has an IP address that shows the right way for the information to reach it. On the internet, it happens the same way. However, there are different standards and address ranges for each type.

When we type an address in the browser bar, the DNS server transforms the address you typed (example: www.Temok.com) for an IP number like this, it is possible to access the server where the site is hosted.

There are special classes of IP addressing and one of them is LOCALHOST which is very simple. When you have a server running on a machine like Apache if you type localhost the browser will redirect you to the server’s root folder. That is, LOCALHOST means the computer itself where a server is running and is often used for internal communication on a network. The localhost simulates the interaction with a remote machine, but being itself, so it can be used for tests on the network as well.

How does Localhost Work?

In the communication of two computers, data packets are sent and received within the framework of TCP / IP protocols. These packages contain the IP addresses of the receiver and the sender as well as the main information.

Computers look at the addresses in the packet to see which packets belong to them on the network. They respond by taking their own packages.

This does not cause a problem in communication between computers with different IP addresses on the same or different networks.

For example, a computer with an IP address of can easily communicate with a computer with an IP address of on the same network using TCP / IP protocols. They can easily distinguish which packets belong to the network card and respond.

However, for the hardware and software in a computer to communicate securely with a hardware or software within the same computer, an address different from the IP address on the network is required. To meet this requirement, the address block has been allocated and defined as localhost.

A virtual network card called a loopback device has been created to control communication over the localhost block created to enable the computer to access itself over TCP / IP.

Thanks to the virtual network card, outgoing data is directed to the computer itself via the address Thus, it is ensured that the data packets sent are returned to the computer itself without leaving the network where it is available so that the computer can communicate safely within itself as you can view in the diagram given below:

How does Localhost Work?

For example: Suppose you have installed WAMP Server on your computer to develop your website designs. With the Apache webserver included in the WAMP Server package, your web pages start to be published over the localhost: 80 port by default.

When you type localhost into your browser, you can view your web pages you designed. Here, for your web browser and the Apache server, localhost is your computer. Your request via the browser is answered by Apache on your computer before it reaches the modem.

Localhost IP Address

Localhost is used to access network services running on the host through a loopback network interface. Using the loopback interface bypasses the local network interface hardware. The local loopback mechanism can be used to run network services on a host without requiring a physical network interface or making the service accessible on the network to which the computer is connected. For example, you can access a locally installed website from a web browser via the URL http://localhost and display the home page.

The IPv4 network standard reserves the entire address block for loopback purposes. This means that all packets sent to one of those addresses ( will be looped back. This address does not change and is valid and the same for all computers. It enables communication between computer hardware. Address is a standard address commonly used for IPv4 loopback traffic. The rest are practically never used. The IPv6 standard only assigns a single address (:: 1) to loopback.

So it’s basically the localhost address used for testing software/applications. These are services provided internally by the operating system. You can ping the localhost address without a working network interface card “NIC”. Easy to test. Now disable the NIC then try pinging “127.x.x.x”.

0 = this. Address 0 is interpreted to mean “this” as in “this network”. For example, the address could be interpreted to mean host 37 on this network. All hosts’ addresses are interpreted to mean “all” as in “all hosts”. For example, the address could be interpreted as meaning 128.9 for all hosts on the network. Class A network number 127 is assigned a “loopback” function. This means that data packets sent to network 127 address in higher-level protocols must be looped back inside the host. Data packets “sent” to network 127 address should not appear on any network.

Why localhost IP

Some people suggest it has to do with previous computer processor limitations. It was chosen for the simplest calculation by the processor.

Others think the booking range was chosen randomly, but I don’t like this theory. When the Internet was created, they couldn’t imagine what the Internet would be like in the years to come. I understand it completely, but these people have randomly chosen geniuses, hardworking people, etc.

What is the Difference between,, and Localhost?

This is usually an IP address assigned to a “loopback” or local-only interface. This is a “fake” network adapter that can only communicate within the same host. It is often used when network-enabled applications want to serve only clients on the same host. Any process that is listening for a connection will only listen for local connections on that socket.

“localhost” is usually the hostname of the IP address It is usually set /etc/hosts(or named “hosts” somewhere in Windows %WINDIR%). You can use it like any other hostname. Try “ping localhost” to see how it solves has two different meanings, but in this context, it means “listen to all available network interfaces” when the server listens. From the server process perspective, loopback adapters with IP addresses are similar to other network adapters in the system, so the listening server also accepts connections on that interface.

It hopefully answers the IP side of your question. I’m not familiar with Jekyll or Vagrant, but port forwarding 8080 => 4000 is somehow bound to a specific network adapter so it’s not in the path when connecting locally

How to setup and open localhost?

How to open localhost? How to set up localhost? How to install a web server program such as Apache or IIS on the computer and how to enable it to respond to HTTP requests via localhost.

If one of the Apache or IIS programs is installed and running on your computer, it means broadcasting via localhost is open. If the web pages being worked on are created with only HTML, CSS, JavaScript, a web server program such as Apache is sufficient.

However, if the pages contain PHP language and MySQL database connections, a PHP interpreter and a MySQL server will also be needed. This means that you need PHP and MySQL server programs besides Apache. You can start working on localhost by installing the programs we recommend.

Localhost setup

We have listed below the best package programs suitable for the operating system for those looking for a localhost program. You can install localhost by choosing one of the programs suitable for your operating system.

Localhost programs for windows

For Windows computers, Wamp Server, XAMPP, AppServ, and EasyPHP are used for localhost. After installing one of these programs, you can create a local server where web pages will be published.

You can turn it into a web development environment by doing one of the following installations on your personal computer and start working on localhost. My suggestions are; XAMPP and WAMP.

XAMPP VS WAMP: Which Server Is Better?

Both servers are better for setting up a localhost environment as per the requirements. So, you can get a detailed comparison of XAMPP Vs Wamp. Here are some key points of the XAMPP server:

  1. It has Linux and Windows support
  2. Open source and free developed by Apache Friends
  3. The administration panel is very simple to use
  4. If you’re interested in Java in the future, there is built-in Tomcat support
  5. Bitnami module greatly simplifies the development of PHP applications by installing Joomla!, Drupal, and WordPress.

Localhost programs for Linux

LAMP and XAMPP packages can be used for Linux operating systems.

To learn how to use localhost, check out the localhost simply explained for dummies and the management panel of the required programs. After installing the necessary programs for localhost, you can start using localhost through the management panel of these programs.

Installing WordPress on localhost is one of the first things to be wondered about after installing localhost programs. It will also be useful to study PHP examples for a while before that.

Where is localhost

You can access the live pages by typing localhost into the browser.

To see the files, you have posted on localhost, check out the localhost program files you use. You can find these files in the htdocs folder for XAMPP and in the www folder for WAMP.

Localhost login: localhost access from browser

Localhost, as can be understood from the word “local”, is a local and limited system. It corresponds to the localhost IPv4 address or the :: 1 IPv6 address.

No unauthorized user can enter any resource published here. You can enter the address bar of web browsers such as Chrome, Firefox on personal computers by typing or http://localhost.

The page that can be accessed directly through these addresses is essentially index pages such as index.html, index.php, which a web server program such as Apache offers in the www or htdocs folder. If you are getting a connection error for localhost access from the browser, the web server program may not be active on your computer.

The use of localhost in website design and development

Web sites are published on a server defined and allocated to them with a domain name. Localhost in this case identifies the server on which the website is published.

For example, let’s say you are installing WordPress on a server. During installation, information about the MySQL database is requested. One of this information is the hostname. If you want to use the MySQL server on the computer (server) you have installed, it is sufficient to write “localhost” as the hostname.

A test environment is required for the design and development stages of websites before they are uploaded and published on the server. This environment can be provided by turning a personal computer into a web server.

A web server is obtained when a computer is installed and run the components that are required for the webserver. The most important of the necessary components and the main program that serves web pages to client computers is a web server program like Apache.

Web designers, software developers, students, or those who are interested in the web world also need a web server on localhost to test their codes and learn web technologies.

The need for testing can be covered by a hosting service, but comes with an internet connection and an additional cost. Personal computers are preferred as they provide a practical development environment rather than cost.

Especially web pages written in programming languages ​​such as PHP and ASP are tested by running them on personal computers. Possible software bugs and vulnerabilities will be fixed early.

Final Words

Those who want to set up a WordPress website, those who deal with PHP, HTML, JavaScript coding, do their trials on localhost before they get hosting, that is, before opening the internet environment. You can start working after installing programs such as Wamp, XAMPP on the computer. By typing localhost or in your browser, you can access the pages and see how they will appear on the internet.

Once you have completed the development phase, the next step is to publish your website on a live server for making it accessible to the public. You also need a domain name before getting live.

Share your experience with us and get more clarity on the concept of localhost by leaving your comments below. I will get back to you as soon as possible and deliver you the best answers.


David Max

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