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$TTL 86400
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@ IN SOA ns1.example.com. admin.example.com. (
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1 ; Serial
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3600 ; Refresh
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1800 ; Retry
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604800 ; Expire
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86400 ) ; Minimum TTL
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IN NS ns1.example.com.
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ns1 IN A 172.20.0.10
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; Delegate subdomain to subdns
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sub IN NS ns1.sub.example.com.
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ns1.sub IN A 172.20.0.20
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