DNS Records Cheatsheet

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