Test Your DNS Servers - RouterSecurity.org
https://www.routersecurity.org/testdns.phpFor secure DNS use security.cloudflare-dns.com (DoH). Their Family service blocks both malware and adult content. It uses 1.1.1.3 and 1.0.0.3. You can verify that it is working both at phishing.testcategory.com and at nudity.testcategory.com. Both pages will NOT display when it is working. For secure DNS use family.cloudflare-dns.com (DoH).