You don’t have to use your ISP’s DNS servers and sometimes can get better results with others. Try these:
Now part of the Cisco empire, the primary is 18.104.22.168 with a backup on 22.214.171.124.
Available in its basic form on 126.96.36.199 (backup 188.8.131.52)
Comodo Secure DNS
Rather like Google in that there is no configuration – using the service is simply a matter of switching to the services primary and backup servers on 184.108.40.206 and 220.127.116.11.
Available on 18.104.22.168 and 22.214.171.124,is almost unique in offering an alternative DNS service without the website logging found on most others.
VeriSign Public DNS
Not to be outdone, VeriSign recently started offering public servers on 126.96.36.199 and 188.8.131.52.