host on the Internet. It is still commonly used, but has been
superseded by the newer IPv6 standard.
host on the Internet. Support is still not universal, but IPv6 should
obsolete IPv4 eventually.
The DNS PTR
IP address to a name. It is used for reverse IP lookups.
The DNS CNAME
equivalent of a redirect or an alias. The referenced name is
specified as a fully qualified DNS name.
Any recursive DNS lookup (
, etc) will use the referenced name instead. The
record is normally only used for subdomains,
The DNS A
maps a name
to an IPv4 address.
The DNS MX
an mail server for the zone (domain). The data format is
is a decimal number, where lower values
have precedence over higher. The hostname
is a fully
qualified DNS name for an SMTP mail server.
The DNS SRV
defines the priority,
weight, hostname, and port number for a specified service.
The DNS TXT
may contain any
information, but it commonly contains the SPF, DKIM or DMARC policies
for the zone (domain) in machine readable form.
The DNS CAA
certificate authorities for a zone (domain).
The DNS NS
the authoritative DNS server for the zone (domain). The server is
specified as a fully qualified name and points to a DNS server.
The DNS SOA
authoritative information about a zone (domain).
The DNS DNSKEY
contains the public
key used to verify a delegated zone (domain) for
The DNS DS
holds the signed
name of the delegated zone (domain) for
The DNS NSEC
contains a link to
the next record name in the zone and lists the record types that exist. Used to
verify the non-existence of a record for