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OSCON 2012

OSCON 2012

We're just one month away from one of the biggest and most exciting events of the year, O'Reilly's Open Source Convention (OSCON). This year's conference will be held July 16th-20th in Portland, Oregon.
Learn Hadoop and get a paper published

Learn Hadoop and get a paper published

We're looking for students who want to try out the Apache Hadoop platform and get a technical report published.
Big Data Week: meetups in SF and around the world

Big Data Week: meetups in SF and around the world

Big Data Week aims to connect data enthusiasts, technologists, and professionals across the globe through a series of meet-ups. The idea is to build community among groups working on big data and to spur conversations about relevant topics ranging from technology to commercial use cases.
Twelve steps to running your Ruby code across five billion web pages

Twelve steps to running your Ruby code across five billion web pages

The following is a guest blog post by Pete Warden, a member of the Common Crawl Advisory Board. Pete is a British-born programmer living in San Francisco. After spending over a decade as a software engineer, including 5 years at Apple, he’s now focused on a career as a mad scientist.
Web Data Commons

Web Data Commons

For the last few months, we have been talking with Chris Bizer and Hannes Mühleisen at the Freie Universität Berlin about their work and we have been greatly looking forward the announcement of the Web Data Commons.
Common Crawl's Advisory Board

Common Crawl's Advisory Board

As part of our ongoing effort to grow Common Crawl into a truly useful and innovative tool, we recently formed an Advisory Board to guide us in our efforts. We have a stellar line-up of advisory board members who will lend their passion and expertise in numerous fields as we grow our vision.
Video Tutorial: MapReduce for the Masses

Video Tutorial: MapReduce for the Masses

Learn how you can harness the power of MapReduce data analysis against the Common Crawl dataset with nothing more than five minutes of your time, a bit of local configuration, and 25 cents.
Gil Elbaz and Nova Spivack on This Week in Startups

Gil Elbaz and Nova Spivack on This Week in Startups

Nova and Gil, in discussion with host Jason Calacanis, explore in depth what Common Crawl is all about and how it fits into the larger picture of online search and indexing. Underlying their conversation is an exploration of how Common Crawl's open crawl of the web is a powerful asset for educators, researchers, and entrepreneurs.
Video: This Week in Startups - Gil Elbaz and Nova Spivack

Video: This Week in Startups - Gil Elbaz and Nova Spivack

Nova and Gil, in discussion with host Jason Calacanis, explore in depth what Common Crawl is all about and how it fits into the larger picture of online search and indexing.
MapReduce for the Masses: Zero to Hadoop in Five Minutes with Common Crawl

MapReduce for the Masses: Zero to Hadoop in Five Minutes with Common Crawl

Common Crawl aims to change the big data game with our repository of over 40 terabytes of high-quality web crawl information into the Amazon cloud, the net total of 5 billion crawled pages.
Common Crawl Discussion List

Common Crawl Discussion List

We have started a Common Crawl discussion list to enable discussions and encourage collaboration between the community of coders, hackers, data scientists, developers and organizations interested in working with open web crawl data.
Answers to Recent Community Questions

Answers to Recent Community Questions

In this post we respond to the most common questions. Thanks for all the support and please keep the questions coming!
Common Crawl Enters A New Phase

Common Crawl Enters A New Phase

A little under four years ago, Gil Elbaz formed the Common Crawl Foundation. He was driven by a desire to ensure a truly open web. He knew that decreasing storage and bandwidth costs, along with the increasing ease of crunching big data, made building and maintaining an open repository of web crawl data feasible.
Video: Gil Elbaz at Web 2.0 Summit 2011

Video: Gil Elbaz at Web 2.0 Summit 2011

Hear Common Crawl founder discuss how data accessibility is crucial to increasing rates of innovation as well as give ideas on how to facilitate increased access to data.

Common Crawl Blog

Announcing a Change to Common Crawl Dataset Size Reporting

April 1, 2026

Common Crawl is switching to reporting dataset sizes in nibbles. As an organisation dedicated to data preservation, we feel it would be remiss to allow this underrepresented unit to fall out of use. Our latest crawl now exceeds 689 tebibbles.

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Host- and Domain-Level Web Graphs January, February, and March 2026

March 24, 2026

We are pleased to announce a new release of host-level and domain-level web graphs based on the crawls of January, February, and March 2026. The graphs consist of 270.2 million nodes and 9 billion edges at the host level, and 120 million nodes and 4.4 billion edges at the domain level.

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March 2026 Crawl Archive Now Available

March 19, 2026

We are pleased to announce the release of the March 2026 crawl, containing 1.97 billion web pages, or 344.64 TiB of uncompressed content. We also observed a dramatic increase in fetches over IPv6, explained by the enabling of Happy Eyeballs in the OkHttp library.

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IPv6 Adoption Across the Top 100K Web Hosts

March 16, 2026

We probed the 100,000 most-linked web hosts for IPv6 support using the Common Crawl Web Graph. Only 36.9% are fully reachable over IPv6, with adoption ranging from 71% among the top 100 to 32% in the long tail.

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Web Graph Statistics Gets a Proper Upgrade

March 6, 2026

Our Web Graph Statistics site has been updated with interactive charts, a domain lookup tool for tracking harmonic centrality and PageRank over time, mobile improvements, unified rank tables with OR filtering, and merged degree plots.

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Measuring Web Accessibility from Crawl Archives

March 2, 2026

A WCAG colour contrast audit of 240 top domains using Common Crawl's February 2026 archive finds four in ten colour pairings fall short of accessibility thresholds. Only one in five sites are fully compliant.

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Announcing the Whirlwind Tour of Common Crawl's Datasets Using Java

February 26, 2026

Introducing the second installment in our Whirlwind Tour series, covering crawl structure, index access, and content extraction, giving developers a practical foundation for building Java-based data workflows.

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Host- and Domain-Level Web Graphs December 2025 and January/February 2026

February 24, 2026

We're happy to announce the release of the Web Graphs for December 2025 and January/February 2026, consisting of 288.6 million nodes and 12.4 billion edges at the host level, and 134.2 million nodes and 5.4 billion edges at the domain level.

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Introducing the New Examples & Resources Browser

February 23, 2026

We've replaced our old Examples and Use Cases pages with a single searchable, filterable browser. 119 resources from 115 contributors, all in one place. Search, filter by type or language, sort, and share links. We welcome community submissions.

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February 2026 Crawl Archive Now Available

February 22, 2026

We are pleased to announce the release of the February 2026 crawl, consisting of 2.1 billion web pages (or 363 TiB of uncompressed content). Captures are from 45.5 million hosts or 37.1 million registered domains.

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AI Plumbers at FOSDEM’26

February 16, 2026

Common Crawl was invited to the AI Plumbers unconference held at FOSDEM this year. The contrast between the 100 people at the unconference, compared to the 10,000 people at the main event, couldn't be bigger.

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CC-Citations: A Visualization of Research Papers Referencing Common Crawl

February 11, 2026

We are proud to release an interactive visualization of thousands of research papers using or citing Common Crawl data.

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CommonLID: Re-evaluating State-of-the-Art Language Identification Performance on Web Data

February 10, 2026

We are excited to announce the release of CommonLID, a language identification benchmark for the web, covering 109 languages. CommonLID was developed in collaboration with multiple open-source organizations and language community groups.

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Host- and Domain-Level Web Graphs November/December 2025 and January 2026

January 30, 2026

The latest Web Graphs from the November and December 2025 and January 2026 crawls are now available, comprising 279.4 million host-level nodes with 13.4 billion edges, and 122.3 million domain-level nodes with 6.1 billion edges.

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January 2026 Crawl Archive Now Available

January 28, 2026

We are pleased to announce the release of the January 2026 crawl archive, containing 2.3 billion web pages, or 398 TiB of uncompressed content.

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Web Archives for Social Sciences Datathon, Bristol

January 26, 2026

Recently, a two-day Bristol datathon used Common Crawl web archives to analyse UK industries and policy, strengthening social science research through hands-on, team-based work.

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How SEOs Are Using Common Crawl's Web Graph Data for AI Ranking Signals

January 19, 2026

As SEOs grapple with the shift from traditional Search Engine Optimization to AI visibility, they're discovering a resource that's been powering AI training for years: Common Crawl's Web Graph.

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GneissWeb Annotations Examples

January 13, 2026

A new Common Crawl index annotation has been added to Hugging Face and our S3 bucket.

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Common Crawl at the Mozilla Festival 2025

January 5, 2026

From the 6th to the 10th of November 2025, Pedro Ortiz Suarez attended Mozfest in Barcelona, as well as some satellite events.

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Host- and Domain-Level Web Graphs October, November, December 2025

December 23, 2025

We are pleased to announce a new release of host-level and domain-level web graphs based on the crawls of October, November, and December 2025.

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December 2025 Crawl Archive Now Available

December 20, 2025

The crawl archive for December 2025 is now available, consisting of 2.16 billion web pages (or 364 TiB of uncompressed content).

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A Sampling of 2025 Research Referencing Common Crawl

December 5, 2025

As another year here at Common Crawl comes to a close, we present a dozen papers from 2025 that demonstrate the range of topics and areas of study for which Common Crawl’s datasets are used and referenced.

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Host- and Domain-Level Web Graphs September, October, and November 2025

November 24, 2025

We are pleased to announce the release of the web graphs based on the crawls of September, October, and November of 2025, consisting of 235.7 million nodes and 9.5 billion edges at the host level, and 100.7 million nodes and 6.6 billion edges at the domain level.

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November 2025 Crawl Archive Now Available

November 23, 2025

We are pleased to announce that the crawl archive for November 2025 is now available, containing 2.29 billion web pages or 378 TiB of uncompressed content.

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Common Crawl Celebrates World Digital Preservation Day

November 6, 2025

Common Crawl celebrates World Digital Preservation Day Nov. 6, which invites the community to unite in answering a powerful question: Why Preserve?

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