HostSailor's private DNS IP addresses (IPv4) are as follows:
- 185.82.201.155
- 185.45.193.140
Please note, that you can only use them on HostSailor's services, it will not work for any public use.
For Linux a quick solution would be:
cat > /etc/resolv.conf
nameserver 185.82.201.155
nameserver 185.45.193.140