I use various Comodo tools to protect my Windows based computers. One service offering that I noticed recently was their Secure DNS that provides an alternative to the DNS provided by my ISP. Making the change is straight forward in DHCP or resolver configuration. If you need instructions they can be found here.
The IP addresses for Comodo’s Secure DNS are:-
156.154.70.22
156.154.71.22
Other secure DNS providers include
8.8.8.8
8.8.4.4
208.67.222.222
208.67.220.220