zone <string> [ <class> ] { type primary; allow-query { <address_match_element>; ... }; allow-query-on { <address_match_element>; ... }; allow-transfer [ port <integer> ] [ transport <string> ] { <address_match_element>; ... }; allow-update { <address_match_element>; ... }; also-notify [ port <integer> ] { ( <remote-servers> | <ipv4_address> [ port <integer> ] | <ipv6_address> [ port <integer> ] ) [ key <string> ] [ tls <string> ]; ... }; alt-transfer-source ( <ipv4_address> | * ) ; // deprecated alt-transfer-source-v6 ( <ipv6_address> | * ) ; // deprecated auto-dnssec ( allow | maintain | off ); // deprecated check-dup-records ( fail | warn | ignore ); check-integrity <boolean>; check-mx ( fail | warn | ignore ); check-mx-cname ( fail | warn | ignore ); check-names ( fail | warn | ignore ); check-sibling <boolean>; check-spf ( warn | ignore ); check-srv-cname ( fail | warn | ignore ); check-wildcard <boolean>; database <string>; dialup ( notify | notify-passive | passive | refresh | <boolean> ); // deprecated dlz <string>; dnskey-sig-validity <integer>; dnssec-dnskey-kskonly <boolean>; dnssec-loadkeys-interval <integer>; dnssec-policy <string>; dnssec-secure-to-insecure <boolean>; dnssec-update-mode ( maintain | no-resign ); file <quoted_string>; forward ( first | only ); forwarders [ port <integer> ] { ( <ipv4_address> | <ipv6_address> ) [ port <integer> ]; ... }; inline-signing <boolean>; ixfr-from-differences <boolean>; journal <quoted_string>; key-directory <quoted_string>; masterfile-format ( raw | text ); masterfile-style ( full | relative ); max-ixfr-ratio ( unlimited | <percentage> ); max-journal-size ( default | unlimited | <sizeval> ); max-records <integer>; max-records-per-type <integer>; max-transfer-idle-out <integer>; max-transfer-time-out <integer>; max-types-per-name <integer>; max-zone-ttl ( unlimited | <duration> ); notify ( explicit | master-only | primary-only | <boolean> ); notify-delay <integer>; notify-source ( <ipv4_address> | * ) ; notify-source-v6 ( <ipv6_address> | * ) ; notify-to-soa <boolean>; nsec3-test-zone <boolean>; // test only parental-agents [ port <integer> ] { ( <remote-servers> | <ipv4_address> [ port <integer> ] | <ipv6_address> [ port <integer> ] ) [ key <string> ] [ tls <string> ]; ... }; parental-source ( <ipv4_address> | * ) ; parental-source-v6 ( <ipv6_address> | * ) ; serial-update-method ( date | increment | unixtime ); sig-signing-nodes <integer>; sig-signing-signatures <integer>; sig-signing-type <integer>; sig-validity-interval <integer> [ <integer> ]; update-check-ksk <boolean>; update-policy ( local | { ( deny | grant ) <string> ( 6to4-self | external | krb5-self | krb5-selfsub | krb5-subdomain | krb5-subdomain-self-rhs | ms-self | ms-selfsub | ms-subdomain | ms-subdomain-self-rhs | name | self | selfsub | selfwild | subdomain | tcp-self | wildcard | zonesub ) [ <string> ] <rrtypelist>; ... } ); zero-no-soa-ttl <boolean>; zone-statistics ( full | terse | none | <boolean> ); };