DNS stands for Domain Name System. Think of it as the internet’s phone book, although that comparison is a little old now. You remember names. Computers prefer numbers.<\/p>\n
Say you type example.com into your browser. Your computer doesn’t immediately know which server hosts that website. It first checks whether it already knows the answer.<\/p>\n
Your device checks its local DNS cache. If the address was looked up recently, the answer might already be sitting there. Fast. No need to ask anyone else.<\/p>\n
If there’s no cached answer, the request usually goes to a DNS resolver. Your internet provider may run one, or you may have chosen another resolver. The resolver takes over from there.<\/p>\n
\u2022 The browser asks for an IP address, because example.com alone doesn’t tell it where to connect.<\/p>\n
\u2022 A cached answer is the easy case. Your computer already knows where to go, so the lookup barely feels like a lookup.<\/p>\n
This is where things get interesting. The resolver doesn’t necessarily have the final answer itself. It starts asking other DNS servers until it finds the information it needs.<\/p>\n
First, it can contact a root DNS server. The root server doesn’t normally tell it the exact IP address. Instead, it points the resolver toward the right top-level domain server, such as the server responsible for .com.<\/p>\n
The resolver then asks that server where it can find the authoritative DNS server for the domain. That authoritative server holds the actual DNS records for the website.<\/p>\n
Once the resolver reaches the authoritative server, it gets the relevant record. For a basic website, this is often an A record containing an IPv4 address. There are other record types too, but we don’t need to disappear down that rabbit hole yet.<\/p>\n
The resolver sends the answer back to your computer. Your browser can finally connect to the server using that IP address.<\/p>\n
Imagine asking for the same website address every single time you opened a page. It would work, but it would be wasteful.<\/p>\n
DNS caching avoids that. The resolver stores DNS answers for a period defined by the record’s TTL, or time to live. Your device may also cache the result.<\/p>\n
\u2022 TTL controls how long an answer stays useful. A short TTL means DNS information gets refreshed more often, which is handy when a website’s server location changes.<\/p>\n
\u2022 Caching is the quiet reason DNS usually feels quicker than you’d expect. Most of the time, you’re not watching the whole lookup happen.<\/p>\n
Your internet connection can be perfectly fine while DNS is having problems. That’s the frustrating part.<\/p>\n
You might be able to reach an IP address directly while a website name refuses to load. A faulty DNS server can make the internet feel broken when the actual connection is still working.<\/p>\n
So DNS isn’t the internet itself. It’s the system that helps your device translate human-friendly domain names into the addresses computers use.<\/p>","protected":false},"excerpt":{"rendered":"
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