.github.io domains list

What is .github.io TLD

.github.io is a hosted publishing namespace operated by GitHub within the .io country-code domain, used to serve user and organization pages. In our taxonomy, we treat this space like a TLD-class zone for comparability across platforms, so we analyze both .github.io domains and .github.io websites as a coherent ecosystem. At present we index 166,828 active hostnames and observe 166,828 live sites, with 166,828 presenting valid DNS. Usage is geographically concentrated, appearing in 1 country, consistent with the namespace’s centralized operator model. This footprint reflects developer-centric publishing rather than broad commercial registration. For evidence-based planning, we provide normalized, deduplicated datasets covering the full .github.io namespace. Download .github.io domain datasets from webatla.

History and key features of .github.io TLD

GitHub introduced the .github.io namespace to separate static pages from repository URLs and to standardize hosting for project documentation, demos, and profiles. The model prioritizes HTTPS by default, repository-driven deployment, and consistent subdomain patterns, allowing reliable measurement of .github.io domains and .github.io websites over time. Recent activity remains steady: we detected 15 new hostnames last week and 18,505 in December 2025 overall, indicating ongoing churn typical of iterative development. Because publication is tied to repositories, lifecycles are shorter and DNS turnover is high, which our crawlers capture with temporal snapshots and age markers. These characteristics make the namespace ideal for longitudinal studies of developer ecosystems. Download historical and current .github.io datasets from webatla.

Why and who choose the .github.io domain

Teams choose the .github.io domain for low-friction publishing, reproducibility, and proximity to code, while organizations use it for documentation, sandbox environments, and proof-of-concept sites. Compared with general-purpose TLDs, .github.io domains and .github.io websites behave more like project endpoints: predictable naming, static content, frequent versioning, and limited commercial signals. Our telemetry shows concentration among OSS maintainers, academic labs, and internal tooling groups, matching the single-operator profile reflected in 1 country of use. With 166,828 active hostnames and 166,828 resolvable entries, discovery remains robust even as projects sunset and reappear. We map technologies, CNAMEs, and response codes to profile maturity and risk for this space. Download segmented .github.io domain data from webatla.