Mac os x hosts file doesnt work

They can be separated by a space, but for ease of reading are typically separated by one or two tabs.

Just search for Notepad, then right-click on Notepad in the search results list, and choose to run it as administrator. To access the hosts file in Windows 7 you can use the following command in the Run Line to open notepad and the file. Once notepad is open you can edit the file. In this example we will block Facebook. To do this just enter in the following after the mark. We also were not able to get to it in Google Chrome… check notes at the end. In Ubuntu You can use your favorite editor or even open your favorite GUI text editor. For this example we will use VIM.

How to edit your Mac's hosts file and why? Tips & tricks

In order to edit the file you will need to open it as root which is why we use sudo here. Now that it is open we can edit it to redirect Facebook into nothing. You will notice that with Ubuntu there is also a section for IP6. For most needs you will only need to edit it the top section and ignore the IP6. For a tutorial on how to do the same on Windows click here.

For example, to emulate DNS change for hostinger.

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This will emulate change IP address of the hostinger. Sometimes changes do not apply instantly and you may need to flush the DNS cache. The hosts file is a very simple text file that can be opened and edited in Windows with the pre-installed editor , for example. Firstly, you see the Windows description of the file. Below this you can define IP addresses and corresponding host names.

The defined IP address is in a common line with the corresponding host name. It is important that the two pieces of information are separated by at least one space. You can also add comments by prefixing them with ' '.

Why would you modify the hosts file?

Blank lines in the text file are ignored. You can also edit the hosts file with a tool. For Windows, there is the free software HostsMan. The data can then be read out from the network.

Edit Locked Host File On Mac OSX Lion

Otherwise it can lead to increased loading times on weak systems. In order to protect your privacy, the video will not load until you click on it. Unfortunately, the hosts file is also a popular target for malware , which infiltrates the system and can change the file by itself. This can lead to users being directed to dangerous sites as well as certain addresses being blocked e.

However, with a good firewall and an active virus scanner, you can usually prevent unauthorized access to the file. It can also do no harm to check the file for unwanted entries from time to time. If you define the hosts file as read-only , you will be protecting it from unauthorized access. What do you need a localhost for?

How to Edit Hosts File on Mac

Sometimes it can be useful to communicate with yourself. This is known as a loopback in network technology: instead of feeding a request to the network — e. We will explain how the connection to The hostname is part of the fully qualified domain name, which can be used for example to find and access websites on the internet.


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A fully qualified domain name FQDN is a domain name that specifies the unique and complete address of a website. It consists of several name parts called labels, each separated by a dot. The mandatory parts of an FQDN are the host name, domain name, and top level domain of the internet presence.


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