DNS Test. Check your DNS server configuration. Check various settings of the DNS serving
a certain domain, see how Internet sees the DNS entries of MX, SOA, many more.
Domain Name System (DNS) is a system that provides conversion between IP and
computer name in the Internet. Thus, DNS can answer the question
Who is
www.example.com with
192.168.100.10, defined as the process to
resolve an address.
Check here the correctness of DNS settings.
For more details:
Wikipedia 
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