You could think of it as the switchboard of the Internet, converting easy-to-remember domain names—e.g., www.google.com —into the unique Internet Protocol (IP) numbers—e.g., 18.104.22.168 — that computers use to communicate with one another.
How to use Google Public DNS
Much like the existing OpenDNS service, Google Public DNS is a public DNS service that you can use as an alternative to your current DNS provider. If you want to use it, you must change the DNS settings for your web connection.
- Go the Control Panel.
- Click Network and Internet, then Network and Sharing Center, then Manage network connections.
- 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.
- Select the Networking tab. Under This connection uses the following items, click Internet Protocol Version 4 (TCP/IPv4), and then click Properties.
- 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.
- Click OK.
- 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.
- Replace those addresses with the IP addresses of the Google DNS servers: 22.214.171.124 and 126.96.36.199.
- Restart the connection you selected in step 3.
- Test that your setup is working correctly; see Testing your new settings below.
- Repeat the procedure for additional network connections you want to change.
Mac OS and Linux
Please refer to Google’s detailed instructions for setting up Google Public DNS.
To test that the Google DNS resolver is working:
- 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.
- From your browser, type in a fixed IP address. You can use http://188.8.131.52/ (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.
- 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.