@ IN 3600 SOA ns1.example.com. hostmaster.example.com. (
1234567890 ; Serial
86400 ; Refresh
3600 ; Retry
3600000 ; Expire
14400 ) ; Negative Cache TTL
@ 3600 NS ns1.example.com.
@ 3600 A 127.0.0.1
test-class 42 IN A 127.0.0.1
test-ttl 400 A 127.0.0.1
test-ttlclass 400 IN A 127.0.0.1
test-ttlclassr IN 400 A 127.0.0.1