A (Host address - Address Mapping record - DNS Host Record)

stores a hostname and its corresponding IPv4 address

hostname

IPv4 address

AAAA (IPv6 host address)

stores a hostname and its corresponding IPv6 address

hostname

IPv6 address

ALIAS (Auto resolved alias)

are virtual alias records resolved by Simple DNS Plus at at the time of each request - providing “flattened” (no CNAME-record chain) synthesized records with data from a hidden source name

CNAME (Canonical name for an alias)

can be used to alias a hostname to another hostname. When a DNS client requests a record that contains a CNAME, which points to another hostname, the DNS resolution process is repeated with the new hostname

alias name

e.g. www.ibm.com

canonical name

e.g. servereast.backup2.ibm.com

MX (Mail eXchange)

• records are used by mail servers to determine where to deliver email
• specifies an Simple Mail Transfer Protocol (SMTP) email server’s hostname for the given domain name

domain

e.g. google.com

hostname of mail server of domain

e.g. aspmx.l.google.com.

NS (Name Server)

specifies that a DNS Zone, such as “example.com” is delegated to a specific Authoritative Name Server, and provides the address of the name server

domain name

e.g. foo.com

hostname of authoritative name server for the domain name

PTR (Reverse-Lookup Pointer)

allows a DNS resolver to provide an IP address and receive a hostname (reverse DNS lookup)

SOA (Start Of Authority)

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

SRV (Service Location - location of service)

a service location record, like MX but for other communication protocols

TXT (Descriptive text)

typically carries machine-readable data such as opportunistic encryption, sender policy framework, DKIM, DMARC, etc.

CERT (Certificate)

stores encryption certificates—PKIX, SPKI, PGP, and so on

DNSKEY (DNSSEC public key)

DS (Delegation Signer)

NSEC (Next Secure)

NSEC3 (Next Secure v. 3)

NSEC3PARAM (NSEC3 Parameters)

RRSIG (RRset Signature)