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Learning DNS for Developers

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amazon.com 216.73.216.152 Your IP DNS Lookup DNS Propagation Checker SPF Record Lookup A Record Lookup AAAA Record Lookup CNAME Record Lookup TXT Record Lookup MX Record Lookup

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_acme-challenge.xenvm-std02.cbs.mpg.de NS records

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Authoritative server is unreachable The authoritative nameserver for this domain name is unreachable or misconfigured.