mszm.cn.		30 IN SOA n1.xundns.com. nsadmin.xundns.com. (
				437896     ; serial
				3600       ; refresh (1 hour)
				600        ; retry (10 minutes)
				86400      ; expire (1 day)
				600        ; minimum (10 minutes)
				)

Name servers:
mszm.cn.		30 IN NS n1.xundns.com.
mszm.cn.		30 IN NS n2.xundns.com.