The NS or “name server” DNS record type is used to specify the authoritative name servers for a domain. It tells DNS resolvers which servers to contact when it’s looking for DNS records for that domain name. This is what allows different organizations to own different domain names. Like a number of other DNS record types, the …
A widespread fallacy among IT professionals is that DNS propagates through some network. So widespread in fact, that there are a couple of DNS checkers dedicated to visualizing the geographic propagation of DNS records. But DNS propagation does not exist. So how does it work? When you request DNS records from the server that is authoritative for that domain …
Every DNS record has a type. This type defines what the content of the record means. For example, a DNS record of type MX contains the location of a mail exchange server. So when you want to know the mail server of some email address, you can perform a DNS lookup that queries the MX records. All …
There are two types of DNS servers: recursive and authoritative. Authoritative servers host data for zones. Recursive DNS servers perform DNS lookups for users, collecting DNS data from one or more authoritative DNS servers along the way. Authoritative DNS servers generally answer DNS queries only for the specific zones they are authoritative for, while a recursive …
Recursive vs Authoritative DNS — What’s the difference? Read More »
The DNS is a massive tree of names containing all the names on the Internet. But it has a single starting point: the DNS root zone. The DNS root zone is the parent of all the DNS TLDs. The DNS root zone gives the DNS a single point to begin. You can find any DNS …
Zone delegation in the DNS is how a parent zone signals to DNS resolvers that authority for a child zone is served by (or delegated to) a different set of servers. This is a fundamental part of the DNS. The DNS is very large, and each zone is owned and managed independently. For example, the .com zone is managed …
A DNS zone represents a portion of the DNS namespace owned and managed as a single unit by one organization. The global DNS is composed of many zones. The most well-known zones are the DNS root zone, where the DNS begins, and the Top Level Domains (TLDs) such as .com, .net, .org, etc. Below the …
A DNS stub resolver is an operating system component that performs DNS name resolution for applications running on a computer, cell phone, or another Internet-connected device. Why is it called a stub resolver? A stub resolver is a partial DNS resolver. It relies on the services of a recursive DNS resolver. Stub resolvers were first …
The Domain Name System (DNS) is a critical piece of the Internet. Its primary function is to translate human-readable names into machine-friendly addresses. But the DNS is also a global directory for other important services on the Internet. All devices connected to the Internet, from the smallest phone to the largest server, have an Internet …
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