NS records for this zone are defined at tsinghua.edu.cn.
This page shows the DNS records for smtps43.tsinghua.edu.cn. 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 smtps43.tsinghua.edu.cn, or any nother domain name, go back to DNS lookup and enter the domain name.