DNS resolver registry · Cloudflare

Cloudflare 1.1.1.1 DNS servers

Cloudflare 1.1.1.1 offers 3 service variants with different filtering, reachable over DNS (53), DoT, DoH. Every address and endpoint below is taken from the operator's documentation; the behaviour is what we measured on 2026-09-24.
1.1.1.1
primary address
12
addresses in 3 variants
Validates
DNSSEC in our test
None sent
client subnet (ECS)
Addresses Check your resolver

Addresses

Cloudflare 1.1.1.1 DNS addresses by variant

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

1.1.1.1

None

IPv4
1.1.1.1
1.0.0.1
IPv6
2606:4700:4700::1111
2606:4700:4700::1001
DoH
https://cloudflare-dns.com/dns-query
DoT
one.one.one.one

1.1.1.1 for Families: malware

Malware

IPv4
1.1.1.2
1.0.0.2
IPv6
2606:4700:4700::1112
2606:4700:4700::1002

1.1.1.1 for Families: malware and adult

Malware and adult content

IPv4
1.1.1.3
1.0.0.3
IPv6
2606:4700:4700::1113
2606:4700:4700::1003

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)

No client subnet reached the authoritative server from any address we probed.

Plain DNS and NXDOMAIN

6/6 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

  • DoH https://cloudflare-dns.com/dns-queryAnswered
  • DoT one.one.one.oneAnswered

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

  • AS13335 CLOUDFLARENET - Cloudflare, Inc.

Queried from, in our probe

  • AS13335 CLOUDFLARENET - Cloudflare, Inc.

In the operator's words

Operator statements

Quoted from the operator's pages and checked word for word. We have not audited these practices.
“A Public Resolver user's IP address (referred to as the client or source IP address) will not be stored in non-volatile storage.”
developers.cloudflare.com
“Cloudflare will delete the truncated IP address within 25 hours.”
developers.cloudflare.com
“Cloudflare will not sell or share Public Resolver users' personal data with third parties or use personal data from the Public Resolver to target any user with advertisements.”
developers.cloudflare.com

Check it

Confirm your device is using Cloudflare 1.1.1.1

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 @1.1.1.1

# Does it pass your subnet on (ECS)?
dig +short TXT o-o.myaddr.l.google.com @1.1.1.1

# Does it validate DNSSEC? SERVFAIL means yes
dig dnssec-failed.org @1.1.1.1

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

Cloudflare 1.1.1.1 questions

What are Cloudflare 1.1.1.1's DNS server addresses?

1.1.1.1: 1.1.1.1, 1.0.0.1, 2606:4700:4700::1111, 2606:4700:4700::1001. 1.1.1.1 for Families: malware: 1.1.1.2, 1.0.0.2, 2606:4700:4700::1112, 2606:4700:4700::1002. 1.1.1.1 for Families: malware and adult: 1.1.1.3, 1.0.0.3, 2606:4700:4700::1113, 2606:4700:4700::1003.

Does Cloudflare 1.1.1.1 validate DNSSEC?

Yes. On 2026-09-24 every Cloudflare 1.1.1.1 address that answered returned SERVFAIL for three deliberately mis-signed domains while resolving ordinary names.

Does Cloudflare 1.1.1.1 support DNS over HTTPS or DNS over TLS?

DoH: https://cloudflare-dns.com/dns-query. DoT: one.one.one.one. 2 of 2 answered our test query on 2026-09-24.

Does Cloudflare 1.1.1.1 send my IP subnet to other servers (ECS)?

We observed no client subnet on any address we probed.

How can I check that I am using Cloudflare 1.1.1.1?

Run a DNS leak test and compare the network it reports with the one Cloudflare 1.1.1.1 queried from in our probe (AS13335). On the command line, dig +short whoami.akamai.net @1.1.1.1 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

Google Public DNS

8.8.8.8 · 8.8.4.4

DNSSEC: validates

Quad9

9.9.9.9 · 149.112.112.112

DNSSEC: validates

OpenDNS

208.67.222.222 · 208.67.220.220

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

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