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The hosts fileWhat Is the Windows Host File? And 6 Surprising Ways to Use ItWhat Is the Windows Host File? And 6 Surprising Ways to Use ItThe Windows Hosts file allows you to define which domain names (websites) are linked to which IP addresses. It takes precedence over your DNS servers, so your DNS servers may say facebook.com is linked to..Read More is used by your computer to map hostnames to IP addresses. By adding or removing lines to your hosts file you can change where certain domains will point when you access them in a browser or using other software.
How can I configure my firewall to block Abobe Illustrator CC 2014 updates on Windows 7? Ask Question. Up vote 4 down vote favorite. I have a very simple question. How can I configure my firewall to block Adobe Illustrator CC 2014 updates on Windows 7? Windows-7 firewall windows-firewall adobe. Possible to block a URL (vs. You can use the loopback IP of localhost and have as many sites map to 127.0.0.1 as you want, or specify other IP’s to redirect a URL to, like 0.0.0.0: Blocking websites in ETC HOSTS File of a Mac 3) Now save the file in nano by hitting control-o and the return key. Add a line for each website you want to block. Type the number 127.0.0.1, followed by a space or tab, and then type the name of a website. Conversely, if you'd like to make sure a web URL doesn't go to its intended site — if you're trying to keep your Mac away from certain sites, use '127.0.0.1.' That'll map it back to your Mac. Even if your Mac is assigned a different IP address by its router, 127.0.0.1 defaults to the local machine thanks to the default settings in that hose file. Mikrotik Block/Stop User Access Internet by Mac/IP Address.
This is an important file and one that is under the computer administrator’s control, so you’ll need an account with full privileges to make any changes. On Mac OS X the process is a little more complicated than simply opening a text file, adding some lines and saving it again; but it’s still easy enough for even complete newbies to do with little trouble.
If you’re running Windows you can find instructions for your operating system hereHow To Block Websites On Your PC Without Using Software [Windows]How To Block Websites On Your PC Without Using Software [Windows]Any website you visit potentially tracks your browsing habits, loads annoying ads, or distributes malicious software. Most of the time, common sense and standard malware protection software can help you steer clear of the worst..Read More.
What It Does
If you’ve landed on this page from a search, there’s a good idea you already know why you want to change the hosts file (and can go ahead and skip down the page to the “Making Changes” section of this article). Still reading? I’ll assume you’re not familiar with this file then.
The hosts file is used to route hostnames including website addresses to IP addresses. If an existing domain is added to this file along with an IP, it will call on that IP rather than where the domain name normally points. There are a range of uses, though the vast majority involve security, blocking hostnames and preventing connections being made.
As an example, web developers often have to use this file to access developer servers which aren’t tied to a domain. By pointing a domain or sub-domain like “mysite1.mysite.com” to the IP at which the development site is located it is easier to access the site. This also helps prevent the rest of the web accessing that server easily.
Another example would be to block access to a domain, so when a website redirects you to an adserver or partner site, you could block that site by adding a line in your hosts file which redirects the IP to your local machine (127.0.0.1). Of course, this only provides a loose safety net as advertisers, spammers, malware distributors and anyone else you might want to keep out are wise.
Your computer (be it Windows, Mac or Linux) will always check for the hosts file on boot, and you won’t need to do anything to enable it. It’s already there. If you’re reading this article you’re probably using a Mac, and you should know that making changes to this portion of the disk will require administrator access.
By far the easiest way of making changes to your hosts file is by using the Terminal app4 Cool Things You Can Do With The Mac Terminal4 Cool Things You Can Do With The Mac TerminalThe Terminal is the Mac OS X analogue of the Windows command prompt, or CMD. It's a tool, as you probably already know, that allows you to control your computer using text commands, as opposed..Read More, rather than the Finder.
Making Changes
This tutorial is for Mac OS X Lion 10.7 and later unless otherwise specified. In order to change the hosts file you should first open the Terminal app. At the prompt type the following:
When prompted, type in your administrator password7 Ways To Make Up Passwords That Are Both Secure & Memorable7 Ways To Make Up Passwords That Are Both Secure & MemorableHaving a different password for each service is a must in today's online world, but there's a terrible weakness to randomly generated passwords: it's impossible to remember them all. But how can you possibly remember..Read More and hit Enter.
Users on Mac OS X 10.6 or earlier will find the file in the /private/etc/hosts location instead.
To give you an idea of what’s going on here, the sudo command provides temporary root-level access, while nano is the name of the program used to make the changes to the file, and /etc/hosts is the location of the file.
Once you’ve entered a password and loaded nano, you’ll see a window that looks roughly like the screenshot below.
You’ll have to use the arrow keys to move the cursor around as your mouse pointer will not work here. Pay attention to the comments, which are signified by “#” symbols. If a line starts with a # it’s ignored, so you can use these lines to help keep the file tidy with descriptions of what each addition does. Similarly, you can use comments to quickly enable or disable changes without removing the rule entirely. This is known as “commenting out”.
Rules should be added in the following format: <IP address> <hostname>, for example: adding “127.0.0.1 google.com” would redirect all google.com requests (but notwww.google.com requests) to your local machine, essentially blocking your machine from accessing Google’s servers.
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Once you’ve added a commented-out description, an IP and a domain you should save the file using the keyboard shortcut Control+O which calls the WriteOut function. You will be asked for a location and file name, but seeing as you’re overwriting a file all you need to do is press Enter. Remember you’re only able to do this because you used the sudo command to gain admin privilege, otherwise you would not have permission to overwrite what the system considers to be a very important file.
Once you’ve hit Enter nano will report how many lines were written, and the changes will be saved. You can quit nano using Control+X to return to the prompt, the changes should be instant.
In the event that your changes don’t register immediately you can flush your DNS by opening Terminal and entering the following:
For users on OS X 10.6 or earlier the following Terminal command is used to flush DNS instead:
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All Done!
And that’s it, you’ve now changed your Mac OS X hosts file and can confidently do it again whenever you want using a few Terminal commands.
Let us know what you’ve been doing to your hosts file in the comments, below.
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You literally saved my life. Thank you so much!
Hi Tim,
You saved me from hours of searching online. Your instructions worked like a charm.
I use MAMP Pro for localhosts but for some reason this one of my locahosts was not removed by MAMP even after completely removing MAMP. After commenting the 127.0.0.1 host in the hosts file I can access the public host.
Thanks a lotI have done this to run a wordpress site that is not yet live. It worked well but now I need to get back to the live site and the command won't delete out of the terminal.. what to do? Also, does anyone know if I can run both the live site and the non live site from the same machine?
Did you ever find an answer to this? I'm in the same boat. I can't see my live site becasue when I visit the URL I can only see the the WordPress test site.
Thanks for the article. It helped me block sites that are not blocked with Parental controls such as buzzfeed and youtube. The Mac parental control does not work on HTTPS sites. Can I have multiple host files for different users on a MAC EI Captain?
Thanks again I will try the new recommendation you have. There is content control in youtube but my kids got around it :(. I just don't want them to access it at all. Thanks again :)
Thanks for good article. I did the same as you guided su but with little complex. Anyway finally its working fine great.
Thanks for this - I trawled around hopelessly for an hour trying to find a way to prevent Hotmail/Outlook sending my wife and son to MSN on log out. Job done by assigning the necessary urls to 127.0.0.1 - Cheers!
I accidentally deleated my hosts file. How can I get it back?
Do I need to reinstall everything?Or you could use Hosts https://www.macupdate.com/app/mac/40003/hosts
Lars van de Kerkhof created a Preferences Pane which does all this seamlessly. https://github.com/specialunderwear/Hosts.prefpane (Shame Apple blocked him from releasing it on the App Store.)
Great with the backup of original and the history of changes.
After editing host files on two Macs I will just say By, by terminal and Welcome Hosts.prefpane from specialunderwear!
Good article. Is there a way to have one centralized host file? Lets say i'm moderating 10 macs either on 1 network or in different parts of the country, can i have all macs draw their host file from 1 server?
I use it to block access to known bad hosts used in malware but haven't done much on it since i started using Little Snitch.