DNS Traversal : http://dns.winvive.com
Dig Web Interface:
http://www.digwebinterface.com/
http://www.nabber.org/projects/dnscheck/
http://dns.measurement-factory.com/tools/dsc/sample/index.html
GRC.com DNS Spoofability Test:
https://www.grc.com/dns/dns.htm
DNS Measurements at a Root Server (PDF Document)
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