The DNS Check in Pingdom Tools will check your DNS health and help you find The DNS check will automatically find out which DNS servers are used by the .
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However, with only authoritative name servers operating, every DNS query must start with recursive queries at the root zone of the Domain Name System and each user system would have to implement resolver software capable of recursive operation. In theory, authoritative name servers are sufficient for the operation of the Internet.
Domain names are often seen in analogy to real estate in that domain names are foundations on which a website can be built, and the highest quality domain names, like sought-after real estate, tend to carry significant value, usually due to their online brand-building potential, use in advertising, search engine optimization, and many other criteria.
Check whether the DNS server is authoritative for the name that is being looked up. For more information about checking for problems with authoritative data, see “Checking for Problems with Authoritative Data” later in this chapter. If the DNS server is authoritative for the name that is being looked up, you probably have a problem with authoritative data. – Or –
If the DNS server is not authoritative for the name that is being looked up, proceed to the next step.
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Some domain name registries, often called network information centers (NIC), also function as registrars to end-users. The major generic top-level domain registries, such as for the com, net, org, info domains and others, use a registry-registrar model consisting of hundreds of domain name registrars (see lists at ICANN or VeriSign).  In this method of management, the registry only manages the domain name database and the relationship with the registrars. The registrants (users of a domain name) are customers of the registrar, in some cases through additional layers of resellers.
If so, it is possible that the zone on the master server includes incompatible resource records that Windows 2000 does not recognize. Check whether the master server is running another DNS server implementation, such as BIND. For a complete list of all RFC-compliant resource record types that are supported by DNS servers that are running under Windows 2000 Server, see Windows 2000 Server Help.
In any event, the name server thus queried will follow the process outlined above, until it either successfully finds a result or does not. If the cache can provide the answer to the request, the resolver will return the value in the cache to the program that made the request. In the case of most home users, the Internet service provider to which the machine connects will usually supply this DNS server: such a user will either have configured that server’s address manually or allowed DHCP to set it; however, where systems administrators have configured systems to use their own DNS servers, their DNS resolvers point to separately maintained name servers of the organization. It then returns its results to the DNS resolver; assuming it has found a result, the resolver duly caches that result for future use, and hands the result back to the software which initiated the request. The DNS resolver will almost invariably have a cache (see above) containing recent lookups. If the cache does not contain the answer, the resolver will send the request to one or more designated DNS servers.
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The character set allowed in the Domain Name System is based on ASCII and does not allow the representation of names and words of many languages in their native scripts or alphabets. Eu is mapped to xn--kbenhavn-54a. ICANN approved the Internationalized domain name (IDNA) system, which maps Unicode strings used in application user interfaces into the valid DNS character set by an encoding called Punycode. Many registries have adopted IDNA.
Some examples of generic names are books. Companies have created brands based on generic names, and such generic domain names may be valuable. A generic domain is a name that defines a general category, rather than a specific or personal instance, for example, the name of an industry, rather than a company name.