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 220.127.116.11 with a backup on 18.104.22.168.
Available in its basic form on 22.214.171.124 (backup 126.96.36.199)
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 188.8.131.52 and 184.108.40.206.
Available on 220.127.116.11 and 18.104.22.168,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 22.214.171.124 and 126.96.36.199.