ktxdn.vn.		30 IN SOA ns3.vdc3.vn. vdconline.tld. (
				2023121342 ; serial
				10800      ; refresh (3 hours)
				3600       ; retry (1 hour)
				604800     ; expire (1 week)
				86400      ; minimum (1 day)
				)

ktxdn.vn.		30 IN TXT "v=spf1 ip4:123.30.144.136 +a +mx ~all"

ktxdn.vn.		30 IN A	203.162.31.118

Mail exchangers:
ktxdn.vn.		30 IN MX 10 mail.ktxdn.vn.

Name servers:
ktxdn.vn.		30 IN NS ns2.vdc3.vn.
ktxdn.vn.		30 IN NS ns3.vdc3.vn.
ktxdn.vn.		30 IN NS ns4.vdc3.vn.
ktxdn.vn.		30 IN NS ns1.vdc3.vn.