In a nutshell, the DNS is the service provider responsible to resolve the domain name “facebook.com” to its IP address (that is 173.252.120.6). Most Internet Service Providers (aka ISPs) automatically allocate primary and secondary DNS server addresses on your computer. But sometimes they are slow, and they may also block access to some websites. To resolve these issues, you just need to change the default DNS servers with one free public DNS server. Find below a list of the best public DNS servers:
| DNS Service | DNS1 | DNS2 |
|---|---|---|
| Google Public DNS | 8.8.8.8 | 8.8.4.4 |
| OpenDNS | 208.67.220.220 | 208.67.222.222 |
| Norton ConnectSafe | 198.153.194.50 | 198.153.192.50 |
| Comodo Secure DNS | 8.20.247.20 | 8.26.56.26 |
| DNS Advantage | 156.154.71.1 | 156.154.70.1 |
| FreeDNS | 37.235.1.174 | 37.235.1.177 |
| GreenTeamDNS | 81.218.119.11 | 209.88.198.133 |
| DNS.WATCH | 84.200.69.80 | 84.200.70.40 |
| Level3 Free DNS | 209.244.0.3 | 209.244.0.4 |
