sf881.com.		30 IN SOA ns3.dns.com. admin.dns.com. (
				1642547165 ; serial
				7200       ; refresh (2 hours)
				3600       ; retry (1 hour)
				1209600    ; expire (2 weeks)
				1800       ; minimum (30 minutes)
				)

Name servers:
sf881.com.		30 IN NS ns3.dns.com.
sf881.com.		30 IN NS ns4.dns.com.