In standard DNS configuration, the reverse lookup zone name for the IPv4 subnet 10.10.10.0/24 (written without a trailing dot) is ____.

The reverse lookup zone created from the `10.10.10.0` network ID is represented in the DNS reverse namespace as `10.10.10.in-addr.arpa`. The lab later asks the student to navigate to this zone to inspect the PTR records created alongside host records. The reverse-zone name identifies the subnet’s reverse mapping space; it is not an ordinary forward domain such as `acme.local`. **Key takeaway:** The IPv4 reverse zone for the lab subnet is `10.10.10.in-addr.arpa`.\n\n**Glossary:** **Network ID**: The network portion that identifies an IP subnet. **in-addr.arpa**: The DNS namespace used for IPv4 reverse lookups. **PTR record**: A record that maps an IP address to a name.