| --- |
| license: cc-by-4.0 |
| language: |
| - en |
| pretty_name: Dead-Web Index |
| size_categories: |
| - 10M<n<100M |
| task_categories: |
| - other |
| tags: |
| - web |
| - dns |
| - link-rot |
| - internet-measurement |
| - reachability |
| - osint |
| - domains |
| configs: |
| - config_name: sample |
| data_files: data/sample.jsonl |
| --- |
| |
| # Dead-Web Index |
|
|
| A reachability census of the **DomCop top 10 million** domains (June 2026). Every domain is probed and labelled **alive / redirect / blocked / dead** twice — once by a *polite* plain-HTTP bot, and once by a *reachability* client with a real Chrome TLS/JA3 fingerprint. This is the dataset behind the Crawlora Dead-Web Index explorer. |
|
|
| ## Headline |
| - **14.1% truly dead** — no DNS, refused/reset connection, nothing listening. |
| - **8.9% blocked but alive** — a live server returning 403 / 429 / anti-bot. |
| - **76.6% alive**, 0.3% redirect. |
| - A real Chrome TLS fingerprint reaches ~72,000 domains the polite bot cannot — the gap between "dead to a bot" and "alive to a browser". |
|
|
| ## What "dead" means |
| A domain is dead **only if genuinely unreachable** — no DNS resolution, a refused/reset connection, or nothing accepting a TCP connection. A server that answers *any* HTTP status (even 404 or 5xx) is alive or blocked, not dead. |
|
|
| ## Files |
| - `data/polite.part-01..10.jsonl.zst` — polite arm, 10 rank-partitioned chunks (zstd-compressed JSONL), 9,992,781 rows total. |
| - `data/reachability.part-01..10.jsonl.zst` — reachability (browser-fingerprint) arm, 9,997,315 rows total. |
| - `data/sample.jsonl` — 1,000-row uncompressed preview (both arms). |
| - `data/manifest.json` — per-chunk rows, rank range, byte size, and sha256. |
| - `data/summary.json` — run-level aggregates (outcome split, by-reason, by-TLD). |
|
|
| Decode with `zstd -dc data/polite.part-*.jsonl.zst`; DuckDB and Polars read `.jsonl.zst` directly. |
|
|
| ## Schema (one JSON record per line) |
| `domain`, `tld`, `rank`, `mode` (polite|reachability), `outcome` (alive|redirect|blocked|dead), `reason`, `first_status`, `final_status`, `final_url`, `scheme`, `hops`, `parked`, `run_id`, `probed_at`. |
|
|
| ## License & sources |
| **CC BY 4.0.** Source repo: https://github.com/Crawlora-org/dead-web-index-data · interactive explorer: https://crawlora.net/dead-web-index · methodology: https://crawlora.net/blog/how-much-of-the-web-is-dead-2026 · produced with the open-source crawlora-deadweb classifier: https://github.com/Crawlora-org/crawlora-deadweb |
|
|
