NS records for this zone are defined at sfnet.com.br.
This page shows the DNS records for 5E71F1MIMEFA18NSD3R2OQ7DMIVGM7QN.sfnet.com.br. By default it shows records of types A, AAAA, CNAME, TXT, NS, MX and SOA.
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To find the DNS records of a subdomain of 5E71F1MIMEFA18NSD3R2OQ7DMIVGM7QN.sfnet.com.br, or any nother domain name, go back to DNS lookup and enter the domain name.