pro.vn.			30 IN SOA dns-master.vnnic.vn. postmaster.vnnic.vn. (
				2017735471 ; serial
				3600       ; refresh (1 hour)
				1800       ; retry (30 minutes)
				604800     ; expire (1 week)
				5400       ; minimum (1 hour 30 minutes)
				)

Name servers:
pro.vn.			30 IN NS d.dns-servers.vn.
pro.vn.			30 IN NS a.dns-servers.vn.
pro.vn.			30 IN NS b.dns-servers.vn.
pro.vn.			30 IN NS f.dns-servers.vn.
pro.vn.			30 IN NS h.dns-servers.vn.
pro.vn.			30 IN NS g.dns-servers.vn.
pro.vn.			30 IN NS e.dns-servers.vn.
pro.vn.			30 IN NS c.dns-servers.vn.