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

Mail exchangers:
muduo.net.		30 IN MX 5 mxbiz1.qq.com.
muduo.net.		30 IN MX 10 mxbiz2.qq.com.

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