DNS.SB is a public DNS resolver service operated by xTom GmbH that emphasizes privacy, speed, and modern encrypted DNS protocols; it is described as a no-logs resolver supporting DNS over HTTPS (DoH) and DNS over TLS (DoT) on the official site DNS.SB and in the xTom announcement xTom blog.
The resolver enforces privacy-preserving behaviors — including not logging DNS queries, not sending EDNS Client Subnet headers, and supporting DNS Query Name Minimisation — as described in the DNS.SB privacy and FAQ pages Privacy Policy and FAQ.
DNS.SB runs on a globally distributed anycast network with multiple locations to provide low-latency resolution worldwide, and it supports IPv4 and IPv6 addresses and DNSSEC validation to protect DNS integrity and prevent cache-poisoning attacks DNS.SB servers & features and FAQ.
The DNS.SB project maintains public repositories for its website and DoH/DoT tooling on GitHub, but the core resolver software itself is not published as an open-source resolver repository; the website and documentation repositories are available at the dns-sb GitHub organization GitHub while the core resolver code is not published there DNS.SB GitHub and xTom's launch post confirms the service operation xTom blog.
