1.1.1.1 is Cloudflare's free public DNS resolver. A DNS resolver translates domain names into IP addresses for any device or network that uses it. Under the same name Cloudflare offers a free app for iOS, Android, macOS, Windows and Linux, built around WARP, which routes a device's traffic through Cloudflare's network and encrypts more of its outgoing traffic so that an internet provider can see less. For businesses, WARP can be integrated with Cloudflare Gateway to protect remote workforces. The service is delivered as a cloud service and is not open source.
Cloudflare, Inc. is headquartered in San Francisco, California, and as a US company falls under US jurisdiction. According to its documentation, the resolver does not keep source IP addresses in non-volatile storage, apart from randomly sampled packets (at most 0.05% of traffic) used for troubleshooting and DoS mitigation. Truncated IP addresses are deleted within 25 hours, while aggregated statistics may be stored indefinitely. The documentation does not state where logs are stored. Cloudflare says it has engaged an accounting firm to audit its practices.