ru4.com.		30 IN SOA dns21.hichina.com. hostmaster.hichina.com. (
				2024102513 ; serial
				3600       ; refresh (1 hour)
				1200       ; retry (20 minutes)
				86400      ; expire (1 day)
				600        ; minimum (10 minutes)
				)

Name servers:
ru4.com.		30 IN NS dns21.hichina.com.
ru4.com.		30 IN NS dns22.hichina.com.