# phpman > perldoc > Net::DNS::RR::NSEC3

## NAME
    [Net::DNS::RR::NSEC3](https://www.chedong.com/phpMan.php/perldoc/Net%3A%3ADNS%3A%3ARR%3A%3ANSEC3/markdown) - DNS NSEC3 resource record

## SYNOPSIS
        use [Net::DNS](https://www.chedong.com/phpMan.php/perldoc/Net%3A%3ADNS/markdown);
        $rr = [Net::DNS::RR](https://www.chedong.com/phpMan.php/perldoc/Net%3A%3ADNS%3A%3ARR/markdown)->new('name NSEC3 algorithm flags iterations salt hnxtname');

## DESCRIPTION
    Class for DNSSEC NSEC3 resource records.

    The NSEC3 Resource Record (RR) provides authenticated denial of existence for DNS Resource
    Record Sets.

    The NSEC3 RR lists RR types present at the original owner name of the NSEC3 RR. It includes the
    next hashed owner name in the hash order of the zone. The complete set of NSEC3 RRs in a zone
    indicates which RRSets exist for the original owner name of the RR and form a chain of hashed
    owner names in the zone.

## METHODS
    The available methods are those inherited from the base class augmented by the type-specific
    methods defined in this package.

    Use of undocumented package features or direct access to internal data structures is discouraged
    and could result in program termination or other unpredictable behaviour.

  algorithm
        $algorithm = $rr->algorithm;
        $rr->algorithm( $algorithm );

    The Hash Algorithm field is represented as an unsigned decimal integer. The value has a maximum
    of 255.

### algorithm
    numeric code translation.

  flags
        $flags = $rr->flags;
        $rr->flags( $flags );

    The Flags field is an unsigned decimal integer interpreted as eight concatenated Boolean values.

    optout
         $rr->[optout(1)](https://www.chedong.com/phpMan.php/man/optout/1/markdown);

         if ( $rr->optout ) {
                ...
         }

        Boolean Opt Out flag.

  iterations
        $iterations = $rr->iterations;
        $rr->iterations( $iterations );

    The Iterations field is represented as an unsigned decimal integer. The value is between 0 and
    65535, inclusive.

  salt
        $salt = $rr->salt;
        $rr->salt( $salt );

    The Salt field is represented as a contiguous sequence of hexadecimal digits. A "-" (unquoted)
    is used in string format to indicate that the salt field is absent.

  saltbin
        $saltbin = $rr->saltbin;
        $rr->saltbin( $saltbin );

    The Salt field as a sequence of octets.

  hnxtname
        $hnxtname = $rr->hnxtname;
        $rr->hnxtname( $hnxtname );

    The Next Hashed Owner Name field points to the next node that has authoritative data or contains
    a delegation point NS RRset.

  typelist
        @typelist = $rr->typelist;
        $typelist = $rr->typelist;
        $rr->typelist( @typelist );

### typelist
    When called in scalar context, the list is interpolated into a string.

  typemap
        $exists = $rr->typemap($rrtype);

### typemap
    NSEC3 record.

  match
        $matched = $rr->match( 'example.foo' );

### match
    owner name of the NSEC3 RR.

  covers
        $covered = $rr->covers( 'example.foo' );

### covers
    that name, falls between the owner name and the next hashed owner name of the NSEC3 RR.

  encloser, nextcloser, wildcard
        $encloser = $rr->encloser( 'example.foo' );
        print "encloser: $encloser\n" if $encloser;

### encloser
    NSEC3 RR.

### nextcloser
    This is only valid after encloser() has returned a valid domain name.

### wildcard
    synthesised. This is only valid after encloser() has returned a valid domain name.

## COPYRIGHT
    Copyright (c)2017,2018 Dick Franks

    Portions Copyright (c)2007,2008 NLnet Labs. Author Olaf M. Kolkman

    All rights reserved.

    Package template (c)2009,2012 O.M.Kolkman and R.W.Franks.

## LICENSE
    Permission to use, copy, modify, and distribute this software and its documentation for any
    purpose and without fee is hereby granted, provided that the original copyright notices appear
    in all copies and that both copyright notice and this permission notice appear in supporting
    documentation, and that the name of the author not be used in advertising or publicity
    pertaining to distribution of the software without specific prior written permission.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
    BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
    NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
    DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

## SEE ALSO
    perl, [Net::DNS](https://www.chedong.com/phpMan.php/perldoc/Net%3A%3ADNS/markdown), [Net::DNS::RR](https://www.chedong.com/phpMan.php/perldoc/Net%3A%3ADNS%3A%3ARR/markdown), RFC5155, RFC9077

    Hash Algorithms <<http://www.iana.org/assignments/dnssec-nsec3-parameters>>