May 2017 Crawl Archive Now Available

The crawl archive for May 2017 is now available! The archive is located in the commoncrawl bucket at crawl-data/CC-MAIN-2017-22/. It contains 2.96 billion+ web pages and over 250 TiB of uncompressed content.

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To improve coverage and freshness we used the top 25 million ranked hosts from the Feb/Mar/Apr 2017 webgraph data set and added about 500 million new URLs (not contained in any crawl archive before), of which:

• 330 million URLs were found by a side crawl within a maximum of 3 links (“hops”) away from the home pages of the top 25 million hosts;
• 160 million URLs are a random sample extracted from sitemaps (if provided by any of these 25 million hosts).

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About 40% of the crawl archive's 2.96 billion URLs overlap with the preceding April 2017 crawl. The following changes have been made to WARC (also WAT and WET) files:

• the timestamp in WARC filenames now indicates the capture time (fetch time) of the WARC content (see details)
• WARC files and the URL index now contain the detected MIME type (based on the actual content) in addition to the "Content-Type" sent in the HTTP response (details).

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To assist with exploring and using the dataset, we provide gzipped files which list all segments, WARC, WAT and WET files. By simply adding either s3://commoncrawl/ or https://data.commoncrawl.org/ to each line, you end up with the S3 and HTTP paths respectively.

The Common Crawl URL Index for this crawl is available at: https://index.commoncrawl.org/CC-MAIN-2017-22/. For more information on working with the URL index, please refer to the previous blog post or the Index Server API. There is also a command-line tool client for common use cases of the URL index.

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