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Cisco Secure Access DNS Resolvers – Anycast IP Addresses

North America (USA-only) DNS resolvers guarantee only that DNS queries are resolved by a USA-based Secure Access data center. Block pages use global Anycast and may go to any data center, including one located outside of the USA.

IPv4 IPv6 Port/Protocol Description
208.67.222.222 2620:119:35::35 53 TCP/UDP Primary
208.67.220.220 2620:119:53::53 53 TCP/UDP Secondary
208.67.220.222 n/a 53 TCP/UDP Tertiary
208.67.222.220 n/a 53 TCP/UDP Quaternary
208.67.221.76 2620:119:17::76 53 TCP/UDP USA only Primary
208.67.223.76 2620:119:76::76 53 TCP/UDP USA only Secondary