1.1.1.1

Developer(s)| Cloudflare
Initial release| April 1, 2018; 8 years ago (2018-04-01)[1]
Stable release|

Android: 6.38.2[2]
iOS: 6.30.3[3]
Linux: Varies per OS[4]
macOS: 2025.2.664[5]
Windows: 2025.2.664[6]

Platform| Android, iOS, Linux, macOS, Windows
Website| one.one.one.one

1.1.1.1 is a free Domain Name System (DNS) service by the American company Cloudflare in partnership with APNIC.[7][needs update] The service functions as a recursive name server, providing domain name resolution for any host on the Internet. The service was announced on April 1, 2018.[8] On November 11, 2018, Cloudflare announced a mobile application of their 1.1.1.1 service for Android and iOS.[9] On September 25, 2019, Cloudflare released WARP, an upgraded version of their original 1.1.1.1 mobile application.[10]

## Contents

* 1 Service
* 2 Technology
* 2.1 Prior usage of the IP address
* 2.2 Cleanup of 1.1.1.1 and 1.0.0.1
* 3 WARP
* 3.1 WARP+ and WARP+ Unlimited
* 4 See also
* 5 References
* 6 External links

## Service

The 1.1.1.1 DNS service operates recursive name servers for public use at the twelve IP addresses listed below.[11] These addresses are mapped to the nearest operational server by anycast routing.[12] The DNS service is also available for Tor clients.[13] Users can set up the service by manually changing their DNS resolvers to the IP addresses below. Mobile users on both Android and iPhone have the alternative of downloading the 1.1.1.1 mobile application, which automatically configures the DNS resolvers on the device.[14]

| 1.1.1.1  | 1.1.1.1 for Families

|
|

Filters domains | No[15] | Blocks malware[15][16] | Blocks malware and adult content[15]
Passes ECS  | No
Validates DNSSEC | Yes
Via DoH | https://cloudflare-dns.com/dns-query[17] | https://security.cloudflare-dns.com/dns-query  | https://family.cloudflare-dns.com/dns-query
Via DoT | one.one.one.one[18]

1dot1dot1dot1.cloudflare-dns.com

| security.cloudflare-dns.com  | family.cloudflare-dns.com
Via IPv4[15] | 1.1.1.1
1.0.0.1  | 1.1.1.2
1.0.0.2  | 1.1.1.3
1.0.0.3
Via IPv6[15] | 2606:4700:4700::1111
2606:4700:4700::1001  | 2606:4700:4700::1112
2606:4700:4700::1002  | 2606:4700:4700::1113
2606:4700:4700::1003

## Technology

1.1.1.1 is a recursive DNS resolver. Cloudflare runs an authoritative DNS resolver with a network of over 20 million Internet properties. With the recursor and the resolver on the same network, some DNS queries can be answered directly.[third-party source needed]

With the release of the 1.1.1.1 mobile application in November 2018, Cloudflare added the ability for users to encrypt their DNS queries over HTTPS (DoH) or TLS (DoT).[19] Later on, a VPN tunnel was implemented based on Cloudflare's own BoringTun, a user-space implementation of WireGuard written in Rust.[20][21][22]

### Prior usage of the IP address

Technology websites noted that by using 1.1.1.1 as the IP address for its service, Cloudflare exposed misconfigurations in existing setups that violated Internet standards (such as RFC 1918). 1.1.1.1 was not a reserved IP address yet was abused by many existing routers (mostly those sold by Cisco Systems) and companies for hosting login pages to private networks, exit pages or other purposes, rendering the proper routing of 1.1.1.1 impossible on those systems.[23][24] Additionally, 1.1.1.1 is blocked on many networks and by multiple ISPs because the simplicity of the address means that it was previously often used inappropriately for testing purposes and not legitimate use.[23] These abuses have led to a huge influx of garbage data to Cloudflare's servers.[24]

### Cleanup of 1.1.1.1 and 1.0.0.1

The 1.0.0.0/8 IP block was assigned in 2010 to APNIC;[25] before this time it was unassigned space.[26] An unassigned IP space, however, is not the same as a reserved IP space for private use (called a reserved IP address).[27] For example, AT&T has said it is working on fixing this issue[non sequitur][28] within its CPE hardware.

## WARP

In September 2019, Cloudflare released a VPN-like service, called WARP, which is built into the 1.1.1.1 app.[29][30][14] WARP is based on Cloudflare's own WireGuard implementation written in Rust called BoringTun.[31] It tunnels the connection between device and nearest Cloudflare data center, claiming to increase connection speed, encrypting data and DNS requests.[10] Connection speed gain is claimed to be achieved by converting TCP traffic to UDP (both IPv4 and IPv6 are supported), DNS resolution inside Cloudflare's network, and direct access to sites which are using Cloudflare's infrastructure.[32]

WARP connects the user through an encrypted tunnel to the closest Cloudflare data center, thereby hiding any traffic from intermediaries such as local network operators or Internet Service Providers. If the user is trying to reach a site or service outside the Cloudflare network, WARP will replace the user's IP address with a Cloudflare address that represents the user's approximate location, thus hiding the user's identity from the site or service. If, however, the user is trying to reach a destination that is managed by Cloudflare, that destination is provided with the user's true IP address in an `X_FORWARDED_FOR` header.[33][34] WARP is thus not quite equivalent to a true VPN.

### WARP+ and WARP+ Unlimited

WARP+ routes users' Internet traffic into less congested pathways using Cloudflare's own private backbone, called Argo, which makes it much faster than basic WARP.

WARP+ was a limited data plan. To get more data to use WARP+, users had to refer more people to use the service.[10][30][35] The WARP+ Referral program is no longer available and has been discontinued.[36]

WARP+ Unlimited is a paid monthly subscription service without data quantity limits.[30][35]

## See also

* 8.8.8.8, a similar public DNS service by Google
* DNS over HTTPS
* DNS over TLS
* Public recursive name server
* IPv4 and IPv6
* Quad9

## References

1. ↑ "Cloudflare launches 1.1.1.1 DNS service that will speed up your internet". Vox Media, LLC. 1 April 2018. https://www.theverge.com/2018/4/1/17185732/cloudflare-dns-service-1-1-1-1.
2. ↑ "1.1.1.1 + WARP: Safer Internet". Cloudflare, Inc. 17 March 2025. https://play.google.com/store/apps/details?id=com.cloudflare.onedotonedotonedotone.
3. ↑ "1.1.1.1: Faster Internet". Cloudflare Inc.. 7 May 2025. https://apps.apple.com/us/app/1-1-1-1-faster-internet/id1423538627.
4. ↑ "WARP Linux Packages". https://pkg.cloudflareclient.com/.
5. ↑ "WARP macOS Client". Cloudflare. https://install.appcenter.ms/orgs/cloudflare/apps/1.1.1.1-macos-1/distribution_groups/release.
6. ↑ "WARP Windows Client". Cloudflare. https://install.appcenter.ms/orgs/cloudflare/apps/1.1.1.1-windows-1/distribution_groups/release.
7. ↑ Huston, Geoff (April 2, 2018). "APNIC Labs enters into a research agreement with Cloudflare". https://blog.apnic.net/2018/04/02/apnic-labs-enters-into-a-research-agreement-with-cloudflare/.
8. ↑ Warren, Tom (2018-04-01). "Cloudflare launches 1.1.1.1 DNS service that will speed up your internet" (in en). https://www.theverge.com/2018/4/1/17185732/cloudflare-dns-service-1-1-1-1.
9. ↑ Cimpanu, Catalin. "Cloudflare launches Android and iOS apps for its 1.1.1.1 service" (in en). https://www.zdnet.com/article/cloudflare-launches-android-and-ios-apps-for-its-1-1-1-1-service/.
10. ↑ 10.0 10.1 10.2 "WARP is here (sorry it took so long)" (in en). 2019-09-25. https://blog.cloudflare.com/announcing-warp-plus/.
11. ↑ "Set up Cloudflare 1.1.1.1 resolver · Cloudflare 1.1.1.1 docs" (in en). 2024-01-17. https://developers.cloudflare.com/1.1.1.1/setup/.
12. ↑ Guðmundsson, Ólafur (2018-04-01). "Introducing DNS Resolver, 1.1.1.1 (not a joke)" (in en). https://blog.cloudflare.com/dns-resolver-1-1-1-1.
13. ↑ "Introducing DNS Resolver for Tor". Cloudflare. June 5, 2018. https://blog.cloudflare.com/welcome-hidden-resolver/.
14. ↑ 14.0 14.1 "1.1.1.1 — The free app that makes your Internet faster." (in en-US). https://1.1.1.1/.
15. ↑ 15.0 15.1 15.2 15.3 15.4 "IP Addresses" (in en-US). 2025-12-27. https://developers.cloudflare.com/1.1.1.1/ip-addresses/.
16. ↑ "Introducing 1.1.1.1 for Families" (in en-US). 2020-04-01. https://blog.cloudflare.com/introducing-1-1-1-1-for-families/.
17. ↑ "Making requests". https://developers.cloudflare.com/1.1.1.1/dns-over-https/request-structure.
18. ↑ "DNS over TLS · 1.1.1.1 docs". https://developers.cloudflare.com/1.1.1.1/encrypted-dns/dns-over-tls#how-it-works.
19. ↑ "Introducing Warp: Fixing Mobile Internet Performance and Security" (in en). 2019-04-01. https://blog.cloudflare.com/1111-warp-better-vpn/.
20. ↑ Krasnov, Vlad (2018-12-18). "BoringTun, a userspace WireGuard implementation in Rust" (in en-US). https://blog.cloudflare.com/boringtun-userspace-wireguard-rust/.
21. ↑ "CloudFlare Launches "BoringTun" As Rust-Written WireGuard User-Space Implementation". https://www.phoronix.com/scan.php?page=news_item&px=CloudFlare-BoringTun-WireGuard.
22. ↑ "The Technical Challenges of Building Cloudflare WARP" (in en). 2019-09-25. https://blog.cloudflare.com/warp-technical-challenges/.
23. ↑ 23.0 23.1 Cherry, Denny (April 5, 2018). "5 reasons Cloudflare's roll-out of 1.1.1.1 has been a disaster" (in en-US). Tech Target. https://itknowledgeexchange.techtarget.com/sql-server/5-reasons-cloudflare-putting-1-1-1-1-horrible/.
24. ↑ 24.0 24.1 "1.1.1.1: Cloudflare's new DNS attracting 'gigabits per second' of rubbish" (in en). ZDNet. April 4, 2018. https://www.zdnet.com/article/1-1-1-1-cloudflares-new-dns-attracting-gigabits-per-second-of-rubbish/.
25. ↑ "1/8 and 27/8 allocated to APNIC" (in en). NANOG. January 21, 2010. http://seclists.org/nanog/2010/Jan/776.
26. ↑ List of assigned /8 IPv4 address blocks
27. ↑ "Fixing reachability to 1.1.1.1, GLOBALLY!" (in en). 2018-04-10. https://blog.cloudflare.com/fixing-reachability-to-1-1-1-1-globally.
28. ↑ @billplein. "Well, they did try to throw Cloudflare under the bus a little but I doubt the person responding realizes that 1.1.1.1 isn't a reserved or special IP address. It just looks like one.". https://twitter.com/billplein/status/981333404397588480. Missing or empty `|date=` (help)
29. ↑ Khalid, Amrita (April 2, 2019). "Cloudflare's privacy-focused DNS app adds a free VPN". https://www.engadget.com/2019/04/01/cloudflares-privacy-focused-dns-app-adds-a-free-vpn/.
30. ↑ 30.0 30.1 30.2 Humphries, Matthew (September 26, 2019). "Cloudflare Finally Launches Warp, But It's Not a Mobile VPN" (in en). https://www.pcmag.com/news/370979/cloudflare-finally-launches-warp-but-its-not-a-mobile-vpn.
31. ↑ "BoringTun, a userspace WireGuard implementation in Rust" (in en). 2019-03-27. http://blog.cloudflare.com/boringtun-userspace-wireguard-rust/.
32. ↑ "The Technical Challenges of Building Cloudflare WARP" (in en). 2019-09-25. http://blog.cloudflare.com/warp-technical-challenges/.
33. ↑ "FAQ · Cloudflare WARP client docs" (in en). 2023-11-09. https://developers.cloudflare.com/warp-client/known-issues-and-faq/.
34. ↑ "WARP BUG ? A website is logging my ISP ip number despite I am browsing with WARP activated" (in en). 2022-04-19. https://community.cloudflare.com/t/warp-bug-a-website-is-logging-my-isp-ip-number-despite-i-am-browsing-with-warp-activated/377603/2.
35. ↑ 35.0 35.1 "What is the difference between WARP, WARP+, and WARP+ Unlimited?". https://support.cloudflarewarp.com/hc/en-us/articles/360025731113.
36. ↑ "Different plans of WARP, 1.1.1.1 and WARP+". https://support.cloudflarewarp.com/hc/en-us/articles/360025731113-What-is-the-difference-between-1-1-1-1-WARP-and-WARP-Unlimited.

## External links

* Official website
* The Cloudflare Blog
* Cloudflare Docs: Setting up 1.1.1.1
* Cloudflare Docs: 1.1.1.1 Public DNS Resolver

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