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Learning DNS for Developers

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amazon.com 216.73.216.129 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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smtp1.builder.nu PTR records

Queried just now

No PTR records No PTR records found for smtp1.builder.nu.

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