If you want to switch to a public DNS server, you have a few options. The most common is Google’s Public DNS, which use the addresses 8.8.8.8 and 8.8.4.4.

If you trust Google less than your ISP, you can also use CloudFlare’s DNS, which claims to be the fastest and takes a privacy-first stance. The main address for it is 1.1.1.1, with an alternate of 1.0.0.1.

Lastly, you can also use OpenDNS, from Cisco, 208.67.222.222 and 208.67.220.220. To use default "family friendly" DNS blocking, use 208.67.222.123 and 208.67.220.123