In the past I was always told by colleagues 22.214.171.124 appears to work faster and have to combine that with Google's public DNS*. Using 126.96.36.199 as primary and 188.8.131.52 as secondary. However, Google only provides 184.108.40.206 and 220.127.116.11, so who provides 18.104.22.168? And if true, why is 22.214.171.124 faster?
*Note: These IP addresses are used to dig domains and to determine if local DNS changes has propagated over all over the internet.