Windows has an inbuilt command line tool – nslookup. It can be used to diagnose the Domain Name System (DNS) infrastructure. It needs TCP/IP installed on your computer to work. The only drawback here ...
It's not necessarily the software at fault, though ...
DNS server isn't responding,' 'DNS lookup failed,' 'NXDOMAIN' and 'DNS resolution timeout' are just some of the possible ways your browser or internet-enabled device tells you there is a DNS failure.
The Address (A) record associates a domain name or subdomain with an IP address, which is the primary purpose of the DNS system. The @ sign identifies "this domain;" for example, A @ nnn.nnn.nnn.nnn ...
Currently I have ISP A and DNS hosting company B<BR><BR>My mail server is on an IP address from ISP A <BR>mx record is provided by DNS company B<BR><BR>Who is responsible for providing the reverse dns ...