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.

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).

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).

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 to each line, you end up with the S3 and HTTP paths respectively.

 File List#FilesTotal Size
Compressed (TiB)
WARC filesCC-MAIN-2017-22/warc.paths.gz5678857.98
WAT filesCC-MAIN-2017-22/wat.paths.gz
WET filesCC-MAIN-2017-22/wet.paths.gz
Robots.txt filesCC-MAIN-2017-22/robotstxt.paths.gz
Non-200 responsesCC-MAIN-2017-22/non200responses.paths.gz567881.38

The Common Crawl URL Index for this crawl is available at: 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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