"dig +short @[IP] dnsscan.shadowserver.org" from computer that does not use the IP listed in the command as it's authoritative DNS server. If the device does support open recursion, you should see the IP address of dnsscan.shadowserver.org returned as the result.
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Open DNS Resolvers Report - A scan report on your network or constituency | SHADOWSERVER
GitHub - j0lly/Odin: Open Dns Resolvers Crawler
GitHub - git-davi/SadTruth: A simple Open DNS Recursive Resolver list generator
GitHub - foae/goscandns: Scanner for open DNS resolvers
GitHub - jpverkamp/dnsscan: Scan IPv4 prefixes for DNS revolvers and classify them as open/closed
GitHub - RoseSecurity/DNS-Fender: A Proof-of-Concept tool utilizing open DNS resolvers to produce an amplification attack against web servers. Using Shodan APIs and native Linux commands, this tool is in development to cripple web servers using spoofed DN
GitHub - birutbhai/Open-DNS-resolver-script: Open DNS resolver script
