How do I know I have opted to the Google public Dns or not?

[sreevi...@gmail.com]

how?

[Alex Dupuy]

If you are using Google Public DNS

$ nslookup -q=TXT test.dns.google.com

Server: 127.0.1.1

Address: 127.0.1.1#53

Non-authoritative answer:

test.dns.google.com text = "Thanks for using Google Public DNS."

Authoritative answers can be found from:

If you are not using Google Public DNS

$ nslookup -q=TXT test.dns.google.com 4.2.2.1

Server: 4.2.2.1

Address: 4.2.2.1#53

** server can't find test.dns.google.com: NXDOMAIN