I have been using 220.127.116.11 as my DNS server for the past few months.
However, this week I was unable to resolve a domain I regularly visit using 18.104.22.168 and the same domain resolves just fine using Google Public DNS (22.214.171.124)
This is the output when I perform an nslookup
C:\Users\carls>nslookup np.edu.sg 126.96.36.199 Server: one.one.one.one Address: 188.8.131.52 *** one.one.one.one can't find np.edu.sg: Server failed C:\Users\carls>nslookup np.edu.sg 184.108.40.206 Server: google-public-dns-a.google.com Address: 220.127.116.11 Non-authoritative answer: Name: np.edu.sg Addresses: 2600:1901:0:8a57:: 18.104.22.168
I have checked and made sure that there is nothing blocking the resolution of the domain in my local network.
Thanks for your time.