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:
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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
Google Public DNS IP addressesThe Google Public DNS IP addresses are as follows:
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 WindowsDNS settings are specified in the TCP/IP Properties window for the selected network connection. Example: Changing DNS server settings on Microsoft Windows Vista
testing To test that the Google DNS resolver is working:
* Google thanks MIT for granting permission to use this URL for the purposes of testing web connectivity. Diagnosing resolution problemsIf 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 serversOpen 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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