windows nslookup
nslookup -d2 mydomain.com returns extensive DNS info

running in interactive mode:
nslookup
server [DNS server IP]
set type=a (or mx, ns, cname, soa, srv, ptr)

great site for dns health check: http://www.intodns.com

note: NS records should match domain registrar NS records

in windows DNS the command dnscmd /statistics will return useful statistics such as total queries received

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