<code>
UPDATEURL="http://dynmhc.de/?hostname=domain"
DOMAIN="domain.dynmhc.de"

registered=$(dig $DOMAIN @a.ns14.net | grep $DOMAIN | grep -v "^;" | awk -- '{print $5}')

  current=$(wget -q -O - http://checkip.dyndns.org|sed s/[^0-9.]//g)
       [ "$current" != "$registered" ] && {                           
          wget -q -O /dev/null $UPDATEURL 
          #echo "DNS updated on:"; date
  }

</code>