Instead, you must save the file elsewhere like the Documents or Desktop folder. You'll be prompted with permission validation and will have to confirm overwriting the file. If you still have trouble saving the modified HOSTS file, check the file's attributes to see if it's been marked read-only.
Right-click the file and select Properties to see the attributes. Another option is to open your text editor program as an administrator so that the permissions are already applied to the editor. Then, saving the HOSTS file over the original can be performed without having to verify your admin credentials. If you still can't save to the HOSTS file location, you probably don't have the correct permissions to be editing files in that folder.
You should be logged in under an account that has administrative rights over the HOSTS file, which you can check by right-clicking the file and going to the Security tab. While this hierarchy might come in handy for regular use, like to block ads or certain malicious IP addresses, its functions also make this file a common target of malware. By modifying it, malware can block access to antivirus updates or force you to a malicious website.
Thus, it's a good idea to check the HOSTS file periodically or at least know how to remove false entries. A much easier way to block certain domains from your computer is to use a custom DNS service that supports content filtering or blocklists. Actively scan device characteristics for identification.
Use precise geolocation data. Select personalised content. Create a personalised content profile. Measure ad performance. But knowing where it is and how it works can be helpful if:. In this article we'll cover what a hosts file is , how to edit it on Windows , and we'll go over some neat tricks you can do with it.
Back in the early days of the internet, before it was widespread, computers used a hosts file to map long, hard to remember IP addresses with much shorter, easier to remember hostnames. That way, instead of having to remember a long IP address, all you had to do was visit localhost.
As the internet grew, so did the length and complexity of the hosts files. Also, each hosts file only worked for the computer it was on, and keeping them in sync with the changes in hostnames and IP addresses became a huge pain.
For example, imagine that you have two computers, A and B. Their hosts files contain this mapping for google. So everyone on computer B is stuck without Google until someone updates the hosts file.
When that person does update the hosts file, they add another entry to handle Google with the www subdomain. Now everyone on computer B is taken to the correct website whether they visit google.
And everyone on computer A can only visit google. If you're thinking that someone should have just made a central repository to map all IP addresses with all hostnames, that's exactly what happened.
Early on, a central hosts file was manually maintained and shared by the Stanford Research Institute. This system lead to the invention of domains and top level domains like. In the end, the humble hosts file and innovators like Elizabeth J. Feinler lead to the invention of the Domain Name System still in use today. First, open Notepad as an administrator by pressing the Windows key, typing in "notepad", and clicking "Run as administrator":. You won't be able to see any files in this directory because they aren't text documents.
To change the file type, click on the dropdown in the bottom right of the Open menu and click on "All Files":. Note that everything is commented out with characters, meaning that nothing is actually being read from the hosts file. Modern versions of Windows include a sort of DNS system already, so if you visit localhost it'll automatically redirect you to If you're doing some local development and are having problems with localhost, you can just remove the comments from your hosts file:.
Then, open PowerShell by pressing the Windows key, searching for "powershell", and clicking "Run as Administrator":. After that, you should be able to visit localhost in your browser and see whatever you're hacking on.
If you're still having issues, try closing your browser completely, then open a new browser window and try again. Even though hosts files have fallen out of favor with newer systems like DNS, they still work for legacy reasons. And hackers have definitely taken advantage of this in the past. What they would do is point a common website like google. This IP address could serve a site that looks just like Google's, but is actually trying to steal your sensitive information.
A menu will expand. Click Run as administrator. This opens Notepad as an administrator. You may have to click Yes on a security warning to open the app. Click the File menu and select Open. This opens your file chooser. Navigate to the path that contains the hosts file. You can paste that path into the bar at the top of the window and press Enter to go there.
It's the menu toward the bottom-right corner of the window. You should now see a handful of files, including the hosts file. The hosts file is now open for editing. Make changes to the file.
Now that the file is open, you can add the correct lines to the file. When you add a line to the hosts file, you'll want to enter the IP address first, followed by the domain name you're mapping it to. Separate the two with a space or a tab, and keep each entry on its own line. Instead of deleting a line, just add a hash symbol to the beginning.
This way you can easily reactivate old entries if you accidentally disable something you needed. Click the File menu and select Save. This saves your changes to the hosts file. Include your email address to get a message when this question is answered. By using this service, some information may be shared with YouTube. You need administrator rights to do this. Helpful 1 Not Helpful 0.
Helpful 0 Not Helpful 0. Be careful deleting the old Hosts File!
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