sysodmins.ru.		30 IN SOA dns1.yandex.net. dns-hosting.yandex.ru. (
				14         ; serial
				900        ; refresh (15 minutes)
				90         ; retry (1 minute 30 seconds)
				86400      ; expire (1 day)
				900        ; minimum (15 minutes)
				)

Name servers:
sysodmins.ru.		30 IN NS dns1.yandex.net.
sysodmins.ru.		30 IN NS dns2.yandex.net.