White Board DNS Records Explained

Short marker board breakdown on the most common DNS records and what data goes in each field. Discussion is crafted with a beginner cybersecurity or threat intelligence Apprentice in mind.
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Most common DNS record types are:
- Address Mapping record (A Record)-also known as a DNS host record, stores a hostname and its corresponding IPv4 address.
- IP Version 6 Address record (AAAA Record)-stores a hostname and its corresponding IPv6 address.
- Canonical Name record (CNAME Record)-can be used to alias a hostname to another hostname.
- Mail exchang record (MX Record)-specifies an SMTP email server for the domain, used to route outgoing emails to an email server.
- Name Server records (NS Record)-specifies that a DNS Zone, such as “cybersecurityisfun.com” is delegated to a specific Authoritative Name Server, and provides the address of the name server.
- Reverse-lookup Pointer records (PTR Record)-allows a DNS resolver to provide an IP address and receive a hostname (reverse DNS lookup).
- Service Location (SRV Record)-a service location record, like MX but for other communication protocols.
- Start of Authority (SOA Record)-this record appears at the beginning of a DNS zone file, and indicates the Authoritative Name Server for the current DNS zone, contact details for the domain administrator, domain serial number, and information on how frequently DNS information for this zone should be refreshed.
- Text Record (TXT Record)-typically carries machine-readable data such as opportunistic encryption, sender policy framework, DKIM, DMARC, etc.
- Certificate record (CERT Record)-stores encryption certificates-PKIX, SPKI, PGP, and so on.
0:32 - A & AAAA records
1:31 - CNAME record
3:32 - MX record
4:48 - NS record
6:42 - PTR record
7:48 - Optional vs Mandatory records
8:36 - SRV record
9:27 - SOA record
9:57 - DNS Zone File
11:10 - TXT record
12:15 - CERT record
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[@anyagiren792]

such a nice refresher on basic DNS zone records, thanks!

[@davidwafula4107]

Good info. thanks

[@gatty.]

Fantastic video! Thank you!

[@hereistheintelligence8847]

Glad you liked it!

[@betterwithrum]

A records are optional. You won't be able to do anything, but they aren't required.... Technically you could have just MX records in a zone and nothing else.

[@gatty.]

Would a mail server still work, even with no A or AAAA record(s)?

[@reynaldoramon5744]

Omg, mosaic! I laughed so hard~~~

[@hereistheintelligence8847]

Yeah, couldn't help it. =]