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glossary:o:open_resolver [2018/06/11 18:54] (current)
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 +# Open Resolver
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 +An Open Resolver [resolver](/​glossary/​r/​resolver) is a [DNS server](/​glossary/​d/​dns_server) that accepts DNS lookups from any client on the Itnernet, without authentication or authorization.
 +
 +This makes the service vulnerable to the DNS Amplification Attack type of [denial of service attack](/​glossary/​d/​ddos).