VeriSign https://www.dnsperf.com/dns-resolver/verisign: This is also a public and free DNS service, and it is popular among internet users because it offers protection against online threats and malware. Verisign also provides customized DNS filtering and advanced system for detecting threats. Its primary DNS Server’s IP address is 64.6.64.6, and its secondary Server’s IP address is 64.6.65.6.