---
license: cc-by-4.0
pretty_name: Dead-Web Common Crawl (2018-2026)
tags:
- web
- link-rot
- common-crawl
- dead-domains
- reachability
configs:
- config_name: sample
  data_files: data/sample.jsonl
---

# Dead-Web Common Crawl — a longitudinal host-reachability panel (2018-2026)

An open dataset labeling the reachability of **172,959,928 registered domains** across **80 monthly
Common Crawl archives** (2018-2026), built from Common Crawl's robotstxt subset and **calibrated
against a live re-probe** to separate genuinely-dead domains from those merely blocking crawlers or
dropped from the crawl.

**~40M domains (~23% of the 8-year union) are calibrated genuinely dead.** Of domains that disappeared
from Common Crawl, only **64.2% [63.5-64.9%]** are truly dead — 31% still resolve, 4.7% are blocked.
Domains last seen *blocked* are only 44.7% dead (the dead-vs-blocked distinction, measured).

Per-domain schema: domain, first_ord, last_ord, total_crawls(80), n_present, last_state,
recent_absence_streak, label (alive_present/dead_candidate/dark_ambiguous/intermittent).

Built with the open-source crawlora-deadweb CLI (https://github.com/Crawlora-org/crawlora-deadweb).
Source repo: https://github.com/Crawlora-org/dead-web-commoncrawl . License: CC BY 4.0.
## Citation

If you use this dataset, please cite the Zenodo archive — concept DOI
**10.5281/zenodo.20814397** (always resolves to the latest version; this release, v1.0.0,
is `10.5281/zenodo.20814398`):

> Crawlora (2026). *Dead-Web Common Crawl: a longitudinal host-reachability panel (2018-2026)*
> [Data set]. Zenodo. https://doi.org/10.5281/zenodo.20814397

**Mirrors:** [Zenodo (DOI)](https://doi.org/10.5281/zenodo.20814397) ·
[GitHub](https://github.com/Crawlora-org/dead-web-commoncrawl) ·
[Kaggle](https://www.kaggle.com/datasets/plantpark/dead-web-commoncrawl)