Domain Name System Query. DNS implements a distributed database to store the name of all the hosts available on the internet. When you search for a domain name in a browser it sends a query over the internet to match the domain with its corresponding IP.
Doing this for multiple domain names over time can help you build a list of available domain names. Domain name resolvers determine the domain name servers responsible for the domain name in question by a sequence of queries starting with the right-most top-level domain label. It will give you the status of whether the domain name that you are looking for is available or not.
This information describes the Domain Name System DNS domain names domain name servers resolvers and resource records.
NSLOOKUP onslookup nsupdate DIG and dig commands used to query name servers. Hostname dnsdomainname and domainname commands used to display the local DNS host name and domain name. A DNS resolver that implements the iterative approach mandated by RFC 1034. DNS stores the database of all.