sibhost.ru.		30 IN SOA ns.sinor.ru. dnsmaster.sinor.ru. (
				2020072720 ; serial
				86400      ; refresh (1 day)
				1800       ; retry (30 minutes)
				604800     ; expire (1 week)
				86400      ; minimum (1 day)
				)

Name servers:
sibhost.ru.		30 IN NS ns.sinor.ru.
sibhost.ru.		30 IN NS ns.risp.ru.