To see if your main router or ISP is redirecting your DNS to their servers you can perform this test.
(You can perform this test on any network, anywhere)
At a Command Prompt
nslookup -type=TXT id.koalasafe.com 184.108.40.206
dig -t TXT id.koalasafe.com @220.127.116.11
This should return a string similar to "id=KoalaSafe version=0.15.267"
If it doesn’t, something is intercepting your DNS.