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user1.jzm015.cn are subdomains to this hostname.

cn
ns-soa records
a.dns.cn
+ 203.119.25.1 203.119.25.0/24 AS24151 -
+ --- -
ns records
a.dns.cn
+ 203.119.25.1 203.119.25.0/24 AS24151 -
+ --- -
b.dns.cn
+ 203.119.26.1 203.119.26.0/24 AS24151 -
c.dns.cn
+ 203.119.27.1 203.119.27.0/24 AS24151 -
d.dns.cn
+ 203.119.28.1 203.119.28.0/24 AS24151 -
e.dns.cn
+ 203.119.29.1 203.119.29.0/24 AS24151 -
ns.cernet.net
+ 202.112.0.44 202.112.0.0/24 AS4538 -
+ --- ns.edu.cn
subdomains
user1.jzm015.cn