DNS resolver registry · Cisco

OpenDNS DNS servers

OpenDNS is run by Cisco and offers 2 service variants with different filtering, reachable over DNS (53). Every address and endpoint below is taken from the operator's documentation; the behaviour is what we measured on 2026-09-24.
208.67.222.222
primary address
4
addresses in 2 variants
Validates
DNSSEC in our test
Sends /24
client subnet (ECS)
Addresses Check your resolver

Addresses

OpenDNS DNS addresses by variant

Set the IPv4 or IPv6 addresses as your DNS servers, or use an encrypted endpoint where one is listed.

OpenDNS Home

Not described on the operator setup page

IPv4
208.67.222.222
208.67.220.220

OpenDNS FamilyShield

Not described on the operator setup page

IPv4
208.67.222.123
208.67.220.123

Measured

What we observed

Measured 2026-09-24 from one vantage point, three rounds per address, majority result. Anycast resolvers can behave differently from other networks. How we test

DNSSEC validation Validates

Returned SERVFAIL for dnssec-failed.org, rhybar.cz and badsig.go.dnscheck.tools on every address that answered, while resolving example.com.

Client subnet (ECS)

Sends /24. The authoritative server received that much of the client address, enough to locate a user to a block of addresses.

Plain DNS and NXDOMAIN

4/4 documented IPv4 addresses answered on port 53. Random non-existent names came back as NXDOMAIN, so errors are not rewritten into ads or search pages.

Encrypted endpoints

None documented on the page we checked.

Networks

Which networks carry it

The announcing network comes from RIPEstat routing data for each documented address. The query network is where the resolver sent its own lookups during our probe, which a DNS leak test reports.

Announcing the service addresses

  • AS36692 CISCO-UMBRELLA - Cisco OpenDNS, LLC

Queried from, in our probe

  • AS36692 CISCO-UMBRELLA - Cisco OpenDNS, LLC

In the operator's words

Operator statements

Quoted from the operator's pages and checked word for word. We have not audited these practices.
“OpenDNS is now part of Cisco”
www.opendns.com

Check it

Confirm your device is using OpenDNS

Changing a DNS setting does not guarantee your lookups reach that resolver: a VPN, a browser's own secure DNS or a proxy can send them elsewhere. Our DNS leak test shows which resolvers actually received your queries.

From a terminal

# Which address did the resolver query from?
dig +short whoami.akamai.net @208.67.222.222

# Does it pass your subnet on (ECS)?
dig +short TXT o-o.myaddr.l.google.com @208.67.222.222

# Does it validate DNSSEC? SERVFAIL means yes
dig dnssec-failed.org @208.67.222.222

Behind a proxy

With an HTTP proxy, or a client set to socks5h://, the proxy side resolves hostnames, so your own resolver setting does not apply to that traffic. With socks5:// in curl or Python requests, your device resolves names first. The SOCKS5 vs SOCKS5h guide shows how to check which one you have.

Questions

OpenDNS questions

What are OpenDNS's DNS server addresses?

OpenDNS Home: 208.67.222.222, 208.67.220.220. OpenDNS FamilyShield: 208.67.222.123, 208.67.220.123.

Does OpenDNS validate DNSSEC?

Yes. On 2026-09-24 every OpenDNS address that answered returned SERVFAIL for three deliberately mis-signed domains while resolving ordinary names.

Does OpenDNS support DNS over HTTPS or DNS over TLS?

The OpenDNS page we checked documents plain DNS addresses only.

Does OpenDNS send my IP subnet to other servers (ECS)?

Yes on at least one address: we observed a /24 client subnet reaching the authoritative server.

How can I check that I am using OpenDNS?

Run a DNS leak test and compare the network it reports with the one OpenDNS queried from in our probe (AS36692). On the command line, dig +short whoami.akamai.net @208.67.222.222 returns the address the resolver used to query Akamai.

Sources

Sources and dates

Documentation checked 2026-09-24. Measured 2026-09-24. Registry reviewed 2026-09-24.

Compare

Other resolvers where DNSSEC validates

Cloudflare 1.1.1.1

1.1.1.1 · 1.0.0.1

DNSSEC: validates

Google Public DNS

8.8.8.8 · 8.8.4.4

DNSSEC: validates

Quad9

9.9.9.9 · 149.112.112.112

DNSSEC: validates

AdGuard DNS

94.140.14.14 · 94.140.15.15

DNSSEC: validates

CleanBrowsing

185.228.168.9 · 185.228.169.9

DNSSEC: validates

Control D Free DNS

76.76.2.0 · 76.76.10.0

DNSSEC: validates
All 20 resolvers

Research library

Network registries & open data

Find the reference behind a network decision. Browse the records, follow their sources and download the available datasets.

Explore research