51host.net.		3599 IN	SOA 51host.net. root.51host.net. (
				2018061214 ; serial
				21600      ; refresh (6 hours)
				7200       ; retry (2 hours)
				604800     ; expire (1 week)
				3600       ; minimum (1 hour)
				)

51host.net.		3599 IN	A 49.4.8.83

Mail exchangers:
51host.net.		3599 IN	MX 10 mail.51host.net.

Name servers:
51host.net.		3599 IN	NS dns1.51.net.
51host.net.		3599 IN	NS dns2.51.net.