https://datatracker.ietf.org/doc/html/draft-dulaunoy-dnsop-passive-dns-cof-01
draft-dulaunoy-dnsop-passive-dns-cof-01
Passive DNS - Common Output Format (Internet-Draft, 2016)
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https://www.first.org/global/sigs/passive-dns/
Passive DNS Exchange
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https://dns-history.whoisxmlapi.com/database
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