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What is Google Public DNS?

Google Public DNS is a free, global Domain Name System (DNS) resolution service, that you can use as an alternative to your current DNS provider.
To try it out:
  • Configure your network settings to use the IP addresses 8.8.8.8 and 8.8.4.4 as your DNS servers or
  • Read our configuration instructions.
If you decide to try Google Public DNS, your client programs will perform all DNS lookups using Google Public DNS.

Why does DNS matter?

The DNS protocol is an important part of the web's infrastructure, serving as the Internet's phone book: every time you visit a website, your computer performs a DNS lookup. Complex pages often require multiple DNS lookups before they start loading, so your computer may be performing hundreds of lookups a day.

Why should you try Google Public DNS?

By using Google Public DNS you can:


important: Before you start
Before you change your DNS settings to use Google Public DNS, be sure to write down the current server addresses or settings on a piece of paper. It is very important that you keep these numbers for backup purposes, in case you need to revert to them at any time.
After changing your settings, if you encounter a problem and cannot connect to the Internet, please call our support numbers for troubleshooting instructions.
We also recommend that you download this page and print it, in the event that you encounter a problem and need to refer to these instructions.

Google Public DNS telephone support

  • 877-590-4367 in the U.S.
  • 770-200-1201 outside the U.S.

Google Public DNS IP addresses

The Google Public DNS IP addresses are as follows:

  • 8.8.8.8
  • 8.8.4.4
You can use either number as your primary or secondary DNS server. You can specify both numbers, but do not specify one number as both primary and secondary.
click on the title to continue.....






change your DNS server settings
Because the instructions differ between different versions/releases of each operating system, we only give one version as an example. If you need specific instructions for your operating system/version, please consult your vendor's documentation. You may also find answers on our user group.
Many systems allow you to specify multiple DNS servers, to be contacted in a priority order. In the following instructions, we provide steps to specify only the Google Public DNS servers as the primary and secondary servers, to ensure that your setup will correctly use Google Public DNS in all cases.
Note: Depending on your network setup, you may need administrator/root privileges to change these settings.

Microsoft Windows

DNS settings are specified in the TCP/IP Properties window for the selected network connection.
Example: Changing DNS server settings on Microsoft Windows Vista
  1. Go the Control Panel.
  2. Click Network and Internet, then Network and Sharing Center, then Manage network connections.
  3. Select the connection for which you want to configure Google Public DNS. For example:
    • To change the settings for an Ethernet connection, right-click Local Area Connection, and click Properties.
    • To change the settings for a wireless connection, right-click Wireless Network Connection, and click Properties.
    If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
  4. Select the Networking tab. Under This connection uses the following items, click Internet Protocol Version 4 (TCP/IPv4), and then click Properties.
  5. Click Advanced and select the DNS tab. If there are any DNS server IP addresses listed there, write them down for future reference, and remove them from this window.
  6. Click OK.
  7. Select Use the following DNS server addresses. If there are any IP addresses listed in the Preferred DNS server or Alternate DNS server, write them down for future reference.
  8. Replace those addresses with the IP addresses of the Google DNS servers: 8.8.8.8 and 8.8.4.4.
  9. Restart the connection you selected in step 3.
  10. Test that your setup is working correctly; see Testing your new settings below.
  11. Repeat the procedure for additional network connections you want to change

testing


To test that the Google DNS resolver is working:
  1. From your browser, type in a hostname, such as http://www.google.com. If it resolves correctly, bookmark the page, and try accessing the page from the bookmark. If both of these tests work, everything is working correctly. If not, go to step 2.
  2. From your browser, type in a fixed IP address. You can use http://18.62.1.6/ (which points to the website http://eecs.mit.edu/) as the URL*. If this works correctly, bookmark the page, and try accessing the page from the bookmark. If these tests work (but step 1 fails), then there is a problem with your DNS configuration; check the steps above to make sure you have configured everything correctly. If these tests do not work, go to step 3.
  3. Roll back the DNS changes you made and run the tests again. If the tests still do not work, then there is a problem with your network settings; contact your ISP or network administrator for assistance.
* Google thanks MIT for granting permission to use this URL for the purposes of testing web connectivity.

Diagnosing resolution problems

If you are encountering problems when resolving particular names, and want to verify whether the problem is with Google Public DNS, please try running the following diagnostic procedures. If you want to report a problem to the Google Public DNS user group, please copy and paste the results of the commands in your email. This information is vital to help us to identify the cause of the problem.

Step 1: Verify that your client can communicate with the Google Public DNS servers

Open a command prompt, and run the following command:
On Windows:
tracert -d 8.8.8.8



Step 2: Verify that Google Public DNS can resolve the selected hostname

At the command prompt, run the following command, where hostname is the name that you were having difficulty resolving:
On Windows:
nslookup -debug hostname 8.8.8.8

Switching back to your old DNS settings

If you had not previously configured any customized DNS servers, to switch back to your old settings, in the window in which you specified the Google IP addresses, select the option to enable obtaining DNS server addresses automatically, and/or delete the Google IP addresses. This will revert your settings to using your ISP's default servers.
If you need to manually specify any addresses, use the procedures above to specify the old IP addresses.
If necessary, restart your system

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