Hide BIND DNS Sever Version

# Open your named.conf
options
{
query-source port 53;
query-source-v6 port 53;
listen-on { 174.ttt.xx.yy; };
directory "/var/named"; // the default
dump-file "data/cache_dump.db";
statistics-file "data/named_stats.txt";
memstatistics-file "data/named_mem_stats.txt";
dnssec-enable yes;
recursion no;
allow-notify { 174.zzz.yy.zz; 172.xx.yy.zz; };
version "BIND";
};

# Save and close the file. Restart named, enter:
service bind9 restart

# How do I see bind version?
dig @ns1.softlayer.com -c CH -t txt version.bind