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 126.96.36.199
dig -t TXT id.koalasafe.com @188.8.131.52
This should return a string similar to "id=KoalaSafe version=0.15.267"
If it doesn’t, something is intercepting your DNS.