$ORIGIN .
$TTL 300	; 5 minutes
example			IN SOA	mname1. . (
				1	   ; serial
				20	   ; refresh (20 seconds)
				20	   ; retry (20 seconds)
				1814400	   ; expire (3 weeks)
				3600	   ; minimum (1 hour)
				)
example		        NS	ns2.example.
ns2.example.		A	10.53.0.2

a.example.		A	10.0.0.1
			MX	10 mail.example.

mail.example.		A	10.0.0.2

lamesub.example.        NS	ns4.example.
ns4.example.	        A	10.53.0.4

0.example.              A       10.53.1.0
1.example.              A       10.53.1.1
2.example.              A       10.53.1.2
3.example.              A       10.53.1.3
4.example.              A       10.53.1.4
5.example.              A       10.53.1.5