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Learning DNS for Developers

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amazon.com 216.73.216.111 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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host-212-18-21-64.customer.m-online.net SPF record

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No SPF record No SPF record found for host-212-18-21-64.customer.m-online.net

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