NSEC3-Records (Next Secure v. 3)

An NSEC3-record links to the next record name in the zone (in hashed name sorting order) and lists the record types that exist for the name covered by the hash value in the first label of the NSEC3 -record's own name.

These records can be used by resolvers to verify the non-existence of a record name and type as part of DNSSEC validation.

NSEC3-records have the same functionality as NSEC-records, except NSEC3 uses cryptographically hashed record names to prevent enumeration of the record names in a zone.

NSEC3-records have the following data elements:

  • Hash Algorithm: The cryptographic hash algorithm used.

  • Flags: "Opt-out" (indicates if delegations are signed or not).

  • Iterations: How many times the hash algorithm is applied.

  • Salt: Salt value for the hash calculation.

  • Next Hashed Owner Name: The name of the next record in the zone (in hashed name sorting order).

  • Record Types: The record types that exist for the name covered by the hash value in the first label of the NSEC3 -record's own name.

To add NSEC3-records to a zone, use the DNSSEC Sign Zone function.

This record type is defined in RFC5155.

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