If you are new to DNS, please read this note on
This tool models the route a typical DNS client takes to fetch an answer
to a question. The question always consists of a domain name and a record
type. There can be many different records for each domain name, for
example amongst the simplest are A records to indicate that there is a
corresponding IP address for the name and MX records to indicate
that there is a mail host for this name. These records can co-exist with
each other. Other records are more complicated,
for example a CNAME cannot be present with any other record, as it
says that all information for the domain name can be found elsewhere - at
the canonical name.
The record types are all documented in the DNS RFC documents
but here is a summary that might help you.
If you don't understand any of this, enter www.example.com and
select A as the record type.
||A host address
||This looks up the equivalent IP address(es) of the name
||Identifies the start of a zone of authority
||Zone boundary, typically a "domain name" in the commercial
||Identifies the canonical name of an alias.
||This looks up the real name of this entry *
||Identifies a mail exchange for the domain
||This looks up the mail servers for this domain name **
||The authoritative name server for the domain
||This looks up the name servers for this domain name
||A domain name pointer
||This looks up the name for a given IP address.
For 18.104.22.168 enter 22.214.171.124.in-addr.arpa
||Any records for the domain
||Asks the name server to respond with everything ***
* dnscheck will indirect through CNAMEs automatically for other
record types (there is an option to turn this off).
** mail clients will attempt direct delivery via an A record if there is no
MX record for a domain name
(RFC2821 section 5).
*** ANY queries on zone boundaries will be answered by the parent name
server: dnscheck will not be referred to the delegated nameserver
(which is why you see NS records and not an SOA record).