There are lot of free public DNS servers are available which are free and reliable.
Here are some of them:
From Verizon:
- 4.2.2.1
- 4.2.2.2
- 4.2.2.3
- 4.2.2.4
- 4.2.2.5
- 4.2.2.6
From Google:
- 8.8.8.8
- 8.8.4.4
We can use these DNS servers independent of our service provider.
-Sany