sdfdc.com.		30 IN SOA . hostmaster.nameserver. (
				2215       ; serial
				21600      ; refresh (6 hours)
				1800       ; retry (30 minutes)
				604800     ; expire (1 week)
				5          ; minimum (5 seconds)
				)

sdfdc.com.		30 IN A	39.107.229.120

Mail exchangers:
sdfdc.com.		30 IN MX 5 mxbiz1.qq.com.
sdfdc.com.		30 IN MX 10 mxbiz2.qq.com.