geodata.cn.		30 IN SOA ns7.dns.net.cn. admin.nsn.idc. (
				411        ; serial
				900        ; refresh (15 minutes)
				600        ; retry (10 minutes)
				86400      ; expire (1 day)
				3600       ; minimum (1 hour)
				)

Name servers:
geodata.cn.		30 IN NS ns7.dns.net.cn.
geodata.cn.		30 IN NS ns.dns.net.cn.
geodata.cn.		30 IN NS ns20.dns.net.cn.