sig.vn.			30 IN SOA ns-master.inet.vn. postmaster.inet.vn. (
				2015072800 ; serial
				10800      ; refresh (3 hours)
				3600       ; retry (1 hour)
				604800     ; expire (1 week)
				360        ; minimum (6 minutes)
				)

sig.vn.			30 IN A	202.92.4.5

Name servers:
sig.vn.			30 IN NS ns2.inet.vn.
sig.vn.			30 IN NS ns1.inet.vn.