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OpenDNS

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description OpenDNS Overview

OpenDNS is a Cisco-owned DNS service with a particular focus on network-wide content filtering. DNS translates website names into the addresses computers use to reach them, so filtering at this stage can restrict access to selected categories of sites. Its parental-control options make it relevant to families seeking shared rules across devices connected to a home network. Small businesses can also use DNS filtering to limit access to unwanted content without configuring a separate browsing rule on every computer.

OpenDNS stands apart from a basic public DNS resolver through its filtering controls and management options. The effectiveness of those controls depends on network configuration, and devices using another DNS service can require additional handling. Speed varies with location and connection, so it should not be treated as a fixed advantage or disadvantage.

help OpenDNS FAQ

Is OpenDNS now owned and operated by Cisco?

Cisco acquired OpenDNS in 2015 and rebranded its enterprise security products as Cisco Umbrella. The OpenDNS name remains for consumer products such as its home DNS offerings. [Cisco OpenDNS history](https://umbrella.cisco.com/opendns-cisco-umbrella)

What DNS addresses does OpenDNS FamilyShield use?

OpenDNS FamilyShield uses 208.67.222.123 and 208.67.220.123. The standard OpenDNS resolvers are 208.67.222.222 and 208.67.220.220. [Cisco FamilyShield instructions](https://www.cisco.com/c/en/us/support/docs/security/umbrella/225803-understand-opendns-familyshield.html)

How does OpenDNS FamilyShield parental filtering work?

FamilyShield uses predefined DNS category settings to block domains commonly classified as adult content. Because it works at the DNS layer, it is not the same as a full firewall or proxy and can be bypassed by changing DNS, using a VPN, or using browser DNS-over-HTTPS. [Cisco FamilyShield explanation](https://www.cisco.com/c/en/us/support/docs/security/umbrella/225803-understand-opendns-familyshield.html)

Will OpenDNS filtering work on a phone using cellular data?

A router-level OpenDNS setup only covers devices that use that router for DNS resolution. A phone on cellular data, a VPN, or browser DNS-over-HTTPS can use a different DNS path and bypass the FamilyShield addresses. [Cisco FamilyShield limitations](https://www.cisco.com/c/en/us/support/docs/security/umbrella/225803-understand-opendns-familyshield.html)

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