- $TTL 300
- @ IN SOA serverb.backend.lab.example.com. root.serverb.backend.lab.example.com. (
- 2020041805 ;serial number
- 1H ;refresh secondary
- 5M ;retry refresh
- 1W ;expire zone
- 1M ) ;cache time-to-live for negative answers
- ; owner TTL CL type RDATA
- 600 IN NS serverb.backend.lab.example.com.
- 10.0.168.192.IN-ADDR.ARPA. IN PTR servera.backend.lab.example.com.
- 11 IN PTR serverb.backend.lab.example.com.
- 12 IN PTR serverc.backend.lab.example.com.
- 13 IN PTR serverd.backend.lab.example.com.
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