Interesting that web site gives me this list:Well I guess the first thing to verify is that your system is working as you think it is. In a CMD window do a IPCONFIG/ALL and check to make sure the DNS values are what you think they're supposed to be configured as.
Also, here's another tool to try: https://www.top10vpn.com/tools/what-is-my-dns-server/
Code:
Country ISP DNS Server
US CLOUDFLARENET - Cloudflare, Inc. 172.70.84.158
US CLOUDFLARENET - Cloudflare, Inc. 172.70.84.161
US WOODYNET-1 - WoodyNet 74.63.26.236
US CLOUDFLARENET - Cloudflare, Inc. 172.70.161.153
US CLOUDFLARENET - Cloudflare, Inc. 172.70.161.152
US CLOUDFLARENET - Cloudflare, Inc. 172.70.161.151
US CLOUDFLARENET - Cloudflare, Inc. 172.70.88.209
US WOODYNET-1 - WoodyNet 74.63.26.239
US WOODYNET-1 - WoodyNet 2620:171:fa:f0::11
2400:cb00:793:1024::ac46:a198
2400:cb00:736:1024::ac45:2b2c
US WOODYNET-1 - WoodyNet 2620:171:fa:f0::239
US WOODYNET-1 - WoodyNet 2620:171:fa:f0::235
WOODYNET looks to be an interesting one? I'll need to look further at some point.