What is 2606:4700:4700::1111?
2606:4700:4700::1111 is the IPv6 address of Cloudflare's public DNS resolver — the IPv6 equivalent of 1.1.1.1. Users who have configured their systems or routers to use Cloudflare DNS and have IPv6 connectivity will send DNS queries to this address. It provides the same privacy-focused, high-performance DNS resolution as the IPv4 version.
Privacy note
If this IPv6 address appears in a DNS leak test, your system is using Cloudflare DNS over IPv6. This is a deliberate configuration rather than a leak, unless you expected a different resolver.