for i in /var/named/*; do
cat $i | sed s#"216\.10\.27\."#"66.96.199."#g > $i.new
mv -f $i.new $i
done

for i in /var/named/*; do
cat $i | sed s#"216\.10\.28\."#"66.96.200."#g > $i.new
mv -f $i.new $i
done

for i in /var/named/*; do    
cat $i | sed s#"216\.10\.29\."#"66.96.201."#g > $i.new
mv -f $i.new $i
done

for i in /var/named/*; do    
cat $i | sed s#"216\.10\.30\."#"66.96.202."#g > $i.new
mv -f $i.new $i
done

for i in /var/named/*; do    
cat $i | sed s#"216\.10\.5\."#"66.96.204."#g > $i.new
mv -f $i.new $i
done