DNS caching allows any DNS server or client to locally store the DNS records and re-use them in the future – eliminating the need for new DNS queries.
The Domain Name System implements a time-to-live (TTL) on every DNS record.
The broadest domain classification is on the right, and becomes more specific as you move to the left.
In the examples below, the top-level domain, or are the second- and third-level subdomains, respectively.
You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.Registries may protect their root nameservers from overuse by setting a high TTL of up to 48 hours or more for those NS records.The first time I learned how DNS gets resolved, I was quite surprised by how long and complicated the process was.If you don’t, the Internet won’t know where to find your DNS information, and your domain won’t resolve.Name servers host a domain’s DNS information in a text file called the Using Linode’s free name servers is the easiest approach, because Linode provides a default zone file with all the right IP addresses for your website and email.Some ISPs ignore TTL settings and only update their cached records every two to three days.