Blocking domain names with bind

Create zone file with name "poison"

@ IN SOA ( ns1.domain.com. hostmaster.domain.com.
           1 10800 3600 86400 21600 )
  IN NS  ns1.domain.com.

save and exit

After setting up the "poison" zone file, you need to direct the domains to this file in your named.conf file. You should add lines (or blocks, if you prefer to keep things on multiple lines) to named.conf which look like this:
named.conf

zone "virus.com" in { type master; file "poison"; };
zone "irfan.com"      in { type master; file "poison"; };
zone "pathan.com" in { type master; file "poison"; };

save and exit

#rndc reload
       or
#service named restart