sf40.com.		30 IN SOA ns1.dns.com. dnsadmin.dns.com. (
				1582786351 ; serial
				7200       ; refresh (2 hours)
				3600       ; retry (1 hour)
				1209600    ; expire (2 weeks)
				1800       ; minimum (30 minutes)
				)

sf40.com.		30 IN A	103.100.210.133

Name servers:
sf40.com.		30 IN NS ns1.dns.com.
sf40.com.		30 IN NS ns2.dns.com.