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Learning DNS for Developers

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amazon.com 216.73.216.180 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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smtp.si21.com AXFR zone transfer

Queried just now

Not an apex domain The domain smtp.si21.com is not the root of its zone.
Instead, try zone transfer on si21.com .