DNS Nameserver Spoofability Test
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In case you're interested, grc.com has made available a “Cache Poisoning” test in order to determine whether your DNS servers might still be vulnerable to the attack.
https://www.grc.com/dns/dns.htm
What I found entertaining is the router crash test they also make available, which my pfSense router passed with flying colors.
https://www.grc.com/dns/crashtest.htm