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Learning DNS for Developers

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amazon.com 216.73.216.59 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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170.10.128.221 Reverse DNS

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This IP has multiple PTR records

us-smtp-inbound-1.mimecast.com
us-smtp-inbound-2.mimecast.com