1.1.1.1, Blokada, AdGuard DNS, Control D, NextDNS, Cisco Umbrella, Google Public DNS, DtDNS, UncensoredDNS, NxFilter, NixNet DNS, CleanBrowsing, DnsWarden, ApateDNS, NextDNS Manager, Yandex.DNS, Comodo Secure DNS, OpenNIC, SafeDNS, AhaDNS, Freenom World, Squidblacklist, Securly, WebTitan DNS Web Filter, BlahDNS, DNS.Watch, DNS Redirector, SaferNet, Blue Reef, FoolDNS, Verisign Public DNS, DNSReactor, Trust DNS, Stubby, DNSX3, SmartViper Public DNS, Safe Web for kids are some alternatives to Quad9.