# phpman > perldoc > Net::DNS::Parameters

## NAME
    [Net::DNS::Parameters](https://www.chedong.com/phpMan.php/perldoc/Net%3A%3ADNS%3A%3AParameters/markdown) - DNS parameter assignments

## SYNOPSIS
        use [Net::DNS::Parameters](https://www.chedong.com/phpMan.php/perldoc/Net%3A%3ADNS%3A%3AParameters/markdown);

## DESCRIPTION
    [Net::DNS::Parameters](https://www.chedong.com/phpMan.php/perldoc/Net%3A%3ADNS%3A%3AParameters/markdown) is a Perl package representing the DNS parameter allocation (key,value)
    tables as recorded in the definitive registry maintained and published by IANA.

## FUNCTIONS
  classbyname, typebyname, opcodebyname, rcodebyname, ednsoptionbyname, dsotypebyname
    Access functions which return the numerical code corresponding to the given mnemonic.

  classbyval, typebyval, opcodebyval, rcodebyval, ednsoptionbyval, dsotypebyval
    Access functions which return the canonical mnemonic corresponding to the given numerical code.

## COPYRIGHT
    Copyright (c)2012,2016 Dick Franks.

    Portions Copyright (c)1997 Michael Fuhr.

    Portions Copyright (c)2003 Olaf Kolkman.

    All rights reserved.

## 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), IANA Registry <<http://www.iana.org/assignments/dns-parameters>>