What DNS records do you know?

There are many types of DNS records, each serving a specific role in the domain name system. The main ones include:

A (Address Record): Links a domain name to an IPv4 address. This is the most common record used for directly specifying the location of a resource on the network.
```
// Example A record
example.com A 192.0.2.1
```
AAAA (IPv6 Address Record): Similar to the A record but links a domain name to an IPv6 address.
```
// Example AAAA record
example.com AAAA 2001:db8::1
```
CNAME (Canonical Name Record): Creates an alias for another domain name. Used to simplify management by linking multiple names to a single resource.
```
// Example CNAME record
www.example.com CNAME example.com
```
MX (Mail Exchange Record): Specifies mail servers responsible for receiving email for the domain, along with their priority.
```
// Example MX records
example.com MX 10 mail.example.com
example.com MX 20 backupmail.example.com
```
TXT (Text Record): Used to store textual information about the domain. Often used for security settings (SPF, DKIM, DMARC) and domain ownership verification.
```
// Example TXT record for SPF
example.com TXT "v=spf1 include:_spf.google.com ~all"
```
PTR (Pointer Record): Used for reverse DNS resolution, linking an IP address to a domain name. Mainly used for rDNS implementation and in mail systems to verify sender legitimacy.
```
// Example PTR record in reverse zone
1.2.0.192.in-addr.arpa PTR example.com
```
NS (Name Server Record): Indicates authoritative DNS servers for a domain or subdomain. These servers provide DNS zone information for the domain.
```
// Example NS records
example.com NS ns1.example.com
example.com NS ns2.example.com
```

SOA (Start of Authority Record): Contains primary information about the DNS zone, including the primary server name, contact person, zone serial number, and caching timings.

// Example SOA record
example.com SOA ns1.example.com admin.example.com (
     2023110101 ; Serial
     3600       ; Refresh
     1800       ; Retry
     604800     ; Expire
     86400      ; Minimum TTL
)

Beyond these main types, there are other less common ones used for specialized purposes, such as:

SRV (Service Record): Defines the location (host and port) of servers for specific services.
DNSKEY (DNS Key Record): Contains a public key for DNSSEC signature verification.
DS (Delegation Signer Record): Links parent and child zones in the DNSSEC chain.
NAPTR (Naming Authority Pointer Record): Used in telephony (ENUM) to convert phone numbers into URIs.