Next Secure (NSEC)

The NSEC RR is part of the DNSSEC (DNSSEC.bis) standard. The NSEC RR points to the next valid name in the zone file and is used to provide proof of non-existense of any name within a zone. The last NSEC in a zone will point back to the zone root or apex. NSEC RRs are created using the dnssec-signzone utility supplied with BIND.

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