$TTL 300	; 5 minutes
@			IN SOA	mname1. . (
				2000042407 ; serial
				20         ; refresh (20 seconds)
				20         ; retry (20 seconds)
				1814400    ; expire (3 weeks)
				3600       ; minimum (1 hour)
				)

example.		NS	ns2.1st.
example.		NS	ns3.1st.
example.		NS	ns4.1st.
example.		NS	ns5.xxx.
foo.example.		A	10.53.0.10