# cat vk.txt 
Server:        192.168.1.1
Address:    192.168.1.1#53

Non-authoritative answer:
Name:    vkontakte.ru
Address: 93.186.224.240
Name:    vkontakte.ru
Address: 93.186.224.241
Name:    vkontakte.ru
Address: 93.186.224.242
Name:    vkontakte.ru
Address: 93.186.224.243
Name:    vkontakte.ru
Address: 87.240.188.249
Name:    vkontakte.ru
Address: 87.240.188.250
Name:    vkontakte.ru
Address: 87.240.188.252
Name:    vkontakte.ru
Address: 87.240.188.254

# X=`sed -rn '1,/^$/d;/^Address:\s+/s///p' vk.txt `

A=( $X )

# i=0; while [ "${A[$i]}" ]; do echo "${A[i]}"; (( i++ )); done
93.186.224.240
93.186.224.241
93.186.224.242
93.186.224.243
87.240.188.249
87.240.188.250
87.240.188.252
87.240.188.254

A=( $X )

#!/bin/bash
BLACKLIST="/var/blacklist.url"

if [ -f $BLACKLIST ]; then
    # удаляем все пробелы, табуляцию и пустые строки
    sed -i '
    s/^[ \t]*//
    s/[ \t]*$//
    /./!d
    ' $BLACKLIST
    while read line
    do
     nslookup ${line} > /tmp/nslookup.tmp
     X=`sed -rn '1,/^$/d;/^Address:\s+/s///p' /tmp/nslookup.tmp`
     A=( $X )
     i=0; while [ "${A[$i]}" ]; do echo "${A[i]}"; (( i++ )); done >> /tmp/blacklist.ip
   done < $BLACKLIST
fi
mv /tmp/blacklist.ip /var/blacklist.ip
rm /tmp/blacklist.ip

cat /var/blacklist.ip

$ bash _наш_скрипт_.bash

#!/bin/bash
BLACKLIST="/var/blacklist.url"
n=1;

if [ -f $BLACKLIST ]; then
    # удаляем все пробелы, табуляцию и пустые строки
    sed -i '
    s/^[ \t]*//
    s/[ \t]*$//
    /./!d
    ' $BLACKLIST
    while read line
    do
     nslookup ${line} > /tmp/nslookup.tmp
     X=`sed -rn '1,/^$/d;/^Address:\s+/s///p' /tmp/nslookup.tmp`
     A=( $X )
     i=0; while [ "${A[$i]}" ]; do echo "${A[i]}"; (( i++ )); done >> /tmp/blacklist.ip
   done < $BLACKLIST
fi
mv /tmp/blacklist.ip /var/blacklist.ip


if [ -f /var/blacklist.ip ] ;
then
cat /var/blacklist.ip | while read line
do
    echo "${line}"
    iptables -I FORWARD $n -d ${line} -j DROP
let n=n+1;
echo $n;
done
fi

    #!/bin/bash
    BLACKLIST="/var/blacklist.url"
    n=1;

    if [ -f $BLACKLIST ]; then
    while read line
    do
    nslookup ${line} >> /tmp/nslookup.tmp;
    done < $BLACKLIST
    fi

    awk '/Address:/ {if($2=="127.0.0.1#53"){} else{print $2 > "/var/blacklist.ip" }}' /tmp/nslookup.tmp

    if [ -f /var/blacklist.ip ] ;
    then
    cat /var/blacklist.ip | while read line
    do
    echo "${line}"
    iptables -R FORWARD $n -d ${line} -j DROP
    let n=n+1;
    echo $n;
    done
    fi

if [ -f $BLACKLISTIP ] ;
then
    cat $BLACKLISTIP | while read line
do
    echo -en "${line}"
    iptables -D _правило_
    iptables -A _правило_
done
fi

if [ -f $BLACKLISTIP ] ;then cat $BLACKLISTIP | while read line; do  echo -en "${line} | ";
iptables -A _правило_ 
done; fi