ss237.cn.		599 IN SOA ns2.dnsdun.com. ns2.dnsdun.com. (
				1          ; serial
				3600       ; refresh (1 hour)
				180        ; retry (3 minutes)
				1209600    ; expire (2 weeks)
				180        ; minimum (3 minutes)
				)

ss237.cn.		119 IN A 50.117.55.113

Mail exchangers:
ss237.cn.		119 IN MX 5 mail.ss237.cn.ss237.cn.

Name servers:
ss237.cn.		3599 IN	NS ns2.dnsdun.net.
ss237.cn.		3599 IN	NS ns2.dnsdun.com.