example.com.        	3	SOA	dns1.example.com. hostmaster.example.com. 2010111227 21600 3600 604800 3
example.com.        	0	NS	dns1.example.com.
example.com.        	2	MX	10 mail.example.com.
dns1.example.com.   	4	A	192.0.2.1
dns1.example.com.   	3	AAAA	2001:db8::1
foo.example.com.    	5	A	192.0.2.4
mail.example.com.   	3	A	192.0.2.3
mail.example.com.   	1	AAAA	2001:db8::3