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

## NAME
    [Net::DNS::RR::NSEC](https://www.chedong.com/phpMan.php/perldoc/Net%3A%3ADNS%3A%3ARR%3A%3ANSEC/markdown) - DNS NSEC 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 NSEC nxtdname typelist' );

## DESCRIPTION
    Class for DNSSEC NSEC resource records.

## 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.

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

    The Next Domain field contains the next owner name (in the canonical ordering of the zone) that
    has authoritative data or contains a delegation point NS RRset.

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

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

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

### typemap
    NSEC record.

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

### match
    canonical owner name of the NSEC RR.

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

### covers
    ancestors, falls between the owner name and the nxtdname field of the NSEC record.

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

### encloser
    NSEC 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)2001-2005 RIPE NCC. Author Olaf M. Kolkman

    Portions Copyright (c)2018-2019 Dick Franks

    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), RFC4034, RFC9077