DNS Records Cheatsheet
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DNS (Domain Name System) takes a human friendly domain names as input and translate that to an IP Address. There are various record types like A record, CNAME, MX, TXT, SRV, AAAA etc.,
Major DNS record types
| Record Type | Description |
|---|---|
| A Record | Points to an IPv4 address |
| AAAA | Similar to A but this allows to point to an IPv6 address |
| CNAME (Canonical Name) | Points to another domain name |
| MX (Mail Exchanger) | Directs email to a mail server |
| TXT | Map domain to text, mostly for information. Often used for verification purpose |
| SRV | Points to a domain name using a specific destination port |
Other DNS record types
| Record Type | Description |
|---|---|
| CAA | Provide additional confirmation for the Certification Authority when validating an SSL certificate |
| CERT | Provides a space in the DNS for certificates and related certificate revocation lists |
| DNSKEY | Contains a public signing key (usually for DNSSEC) |
| DS | Refers to a DNSKEY resource record by including a digest of that DNSKEY resource record |
| LOC | Expressing geographic location information for a domain name |
| NS | Contains the name of the authoritative name server within a domain or DNS zone |
| PTR | Verify that the sender matches the IP address it claims to be using |
| SPF | Lists all the servers authorized to send emails from a particular domain |
| SSHFP | Identifies SSH keys that are associated with a host name. |
| TLSA | Associate a TLS server certificate or public key with the domain name where the record is found |
| URI | Means for publishing mappings from hostnames to URIs |