This is the companion Web page for our work on estimating search index sizes.

  • Recent daily estimates of search engine index size can be accessed on
  • Full data of our longitudinal analysis
  • A complete, color-coded, numbered list of all reported infrastructure changes is available here. Changes shown in bold correspond to the changes highlighted in our paper.


If you want to use this data, please cite the following paper:

  • Antal van den Bosch, Toine Bogers, Maurice de Kunder. A Longitudinal Analysis of Search Engine Index Size. In: Proceedings of ISSI 2015, June 2015