Comparing types and classes of RRs
At the heart of DNS are RRs, which include information on the name, type, Time to Live (TTL), and IP address of the requested resource. In this section, we'll review some of the different types of RRs, along with examining the structure of one.
Let's start by reviewing some of the different types of RRs.
Breaking down DNS types
Whenever you send a request to a DNS server, the request will include the type of record to return. Although there are many types of DNS RR, we'll take a look at some common types, as shown in the following table:
As shown, these are common records; however, there are more. For a comprehensive list of DNS types, visit https://phoenixnap.com/kb/dns-record-types.
Note
An AAAA-type RR, which is an IPv6 address, is also called a Quad A. This type uses four As because an IPv6 address is four times the length of an IPv4 address.
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