So Google’s DNS server is clearly faster for me, but that might not be the case for you. The fastest public DNS server-Google DNS-was only 10.3 percent faster than the default. Surprisingly, when I checked my satellite connection, I found that the high latency means that there are only marginal gains in switching to a different DNS server. Google namebench showed me that the Google DNS server is a whopping 192% faster than my ISP’s server. And Google offers its own public DNS server, which the company claims can “speed up your browsing experience.” OpenDNS claims to be “the world’s fastest and most reliable DNS.” It’s free for personal use, and you can set your Mac or your iOS devices to use this DNS server.
There are two good public DNS servers you can use. But you can change that (and you may want to) in order to speed up some of your Internet activity. If you have standard DSL, cable, or fiber Internet access, your router connects to your ISP’s DNS server. By default, it uses the DNS server that its router connects to. You probably don’t even know which DNS server your Mac uses. But some DNS servers can be slow enough to hobble your activity. This usually isn’t a terrible problem as an extra quarter-second to load a webpage won’t kill you. But if the DNS server your Mac uses is slow or overloaded, this can make some of your Internet activities slower.
In normal circumstances, the amount of time to send a request to a server and get a response is in the tens of milliseconds you can’t even blink your eyes that fast.
If you copy the numerical address and paste it in your browser’s address field, you can still visit that site, assuming the site itself isn’t down. Sometimes DNS servers have glitches, but you can always access a website by using its numerical IP address. You might even want to do this if you’re having trouble accessing a website and need to do so in a hurry. Click the Lookup tab, enter a domain name, then click Lookup. In your /Applications/Utilities folder, there’s a tool called Network Utility. You can find the numerical address for a website, if you want. When you click on a link, your browser sends a request to a Web server to load a page, but that request passes through a DNS server, which stores this information in huge databases containing every single domain recorded listed together with its numerical address.
This is what lets your computer find, keeping track of the fact that this domain name corresponds to an IP address of 70.42.185.230, and that numerical address is hosting Macworld’s webpages. Do you ever wonder how you can click a link on a webpage and quickly zip to another page on a server halfway around the world? Or send an email message to aunt Alice or uncle Bob, using just their simple email addresses? All this depends on DNS, or the Domain Name System.
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