optis.vn.		30 IN SOA ns1.zonedns.vn. root.optis.vn. (
				2015070601 ; serial
				1200       ; refresh (20 minutes)
				600        ; retry (10 minutes)
				1209600    ; expire (2 weeks)
				3600       ; minimum (1 hour)
				)

optis.vn.		30 IN A	128.199.144.61

Mail exchangers:
optis.vn.		30 IN MX 30 alt2.aspmx.l.google.com.
optis.vn.		30 IN MX 30 aspmx3.googlemail.com.
optis.vn.		30 IN MX 10 aspmx.l.google.com.
optis.vn.		30 IN MX 30 aspmx2.googlemail.com.
optis.vn.		30 IN MX 30 aspmx5.googlemail.com.
optis.vn.		30 IN MX 30 aspmx4.googlemail.com.
optis.vn.		30 IN MX 20 alt1.aspmx.l.google.com.

Name servers:
optis.vn.		30 IN NS ns2.zonedns.vn.
optis.vn.		30 IN NS ns1.zonedns.vn.
optis.vn.		30 IN NS ns3.zonedns.vn.