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dig is a network administration command-line tool for querying the Domain Name System (DNS).. dig is useful for network troubleshooting and for educational purposes. [2] It can operate based on command line option and flag arguments, or in batch mode by reading requests from an operating system file.
A DNS name server is a server that stores the DNS records for a domain; a DNS name server responds with answers to queries against its database. The most common types of records stored in the DNS database are for start of authority ( SOA ), IP addresses ( A and AAAA ), SMTP mail exchangers (MX), name servers (NS), pointers for reverse DNS ...
Below the root, Internet resources are organized into a hierarchy of domains, administered by the respective registrars and domain name holders. A DNS name server is a server that stores the DNS records, such as address (A, AAAA) records, name server (NS) records, and mail exchanger (MX) records for a domain name (see also List of DNS record ...
Distributed denial-of-service attacks on root nameservers are Internet events in which distributed denial-of-service attacks target one or more of the thirteen Domain Name System root nameserver clusters. The root nameservers are critical infrastructure components of the Internet, mapping domain names to IP addresses and other resource record ...
service: the symbolic name of the desired service. proto: the transport protocol of the desired service; this is usually either TCP or UDP. name: the domain name for which this record is valid, ending in a dot. ttl: standard DNS time to live field. IN: standard DNS class field (this is always IN). SRV: Type of Record (this is always SRV).
In Windows Vista (and Windows Server 2008) Microsoft moved the registration functionality from the DHCP Client service to the DNS Client service. Servers running Microsoft Windows also attempt to register other information, in addition to their names and IP addresses, such as the locations of the LDAP and Kerberos services that they provide.
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A root name server is a name server for the root zone of the Domain Name System (DNS) of the Internet. It directly answers requests for records in the root zone and answers other requests by returning a list of the authoritative name servers for the appropriate top-level domain (TLD).