The company first launched the 188.8.131.52 service to great fanfare on April 1, earlier this year. The service is a basic DNS server, but one for which Cloudflare has guaranteed user privacy and improved look-up speed.
The service has seen a few DDoS attacks after its launch, and most of the traffic it sees has been deemed garbage, but privacy advocates have deemed it a success.
Activists and journalists have used it to bypass blocklists in oppressive countries, and regular users have also used it to improve their day-to-day Internet connections.
Furthermore, funneling DNS traffic through Cloudflare's DNS server also prevents internet service providers from watching over a user's traffic by looking at DNS logs. Of course, using 184.108.40.206 as your DNS service won't be enough. Users would also need to take other steps to hide traffic from nosy ISPs, such as using an encrypted VPN or making sure the websites they access support HTTPS.
Using 220.127.116.11 requires users modifying their local Internet connection's preferred DNS servers and changing their ISP-supplied settings with Cloudflare's 18.104.22.168 IP address.
Mobile users could have used 22.214.171.124 immediately after its launch, but very few did, as there's no easy way of changing DNS settings on a mobile device, like there is on PCs.
With today's Android and iOS apps, Cloudflare has made switching to 126.96.36.199 as your phone's primary DNS server as easy as pushing a button.