Freely available data

SWITCH publishes open data and makes it available to the public on this website in order to create added value and improve transparency, innovation and efficiency.

Open data on .ch domain names

Open data on .ch domain names provides an overview of the use of .ch domain name usage and the Swiss internet. The data offers an overview of historical development and also enables interested parties to conduct research and develop new insights and services related to the use of .ch domain names and the Swiss internet by combining this information with other data sources.

SWITCH publishes domain names and DNS data on this website, in compliance with all relevant data protection regulations. Based on experiences and feedback provided by users, SWITCH aims to offer more data on domain names publicly in future. We welcome feedback at

Selected Open Data

Since July 2018, we have been publishing a CSV file with the top 1,000 .ch domain names here each month. This file contains the domain names most frequently searched for on the DNS. The CSV files go back to July 2017, as we have access to data from this point onwards.

What does the list reveal?

These .ch domain names are the most important on the Swiss internet. They account for a significant proportion of internet traffic and are therefore highly dependent on a stable, secure Swiss internet.

How is it measured?

Initially, we measured the number of distinct resolvers that query and for each domain. The queries do not only come from web services, but also from email and all other internet services. From february 2019 on (i.e. data from february 2019) our method changes slightly1. We now measure the distinct number of ASes per domain instead of the distinct number of resolvers. Have a look the updated blog article to find out why. Additionally, there will be two datasets, one that ignores NXDOMAIN queries and one that does not. In the past there has only been one dataset including NXDOMAIN queries.


Latest - Latest (with NXDOMAIN)
July 2020 - July 2020 (with NXDOMAIN)
June 2020 - June 2020 (with NXDOMAIN)
May 2020 - May 2020 (with NXDOMAIN)
April 2020 - April 2020 (with NXDOMAIN)
March 2020 - March 2020 (with NXDOMAIN)
February 2020 - February 2020 (with NXDOMAIN)
January 2020 - January 2020 (with NXDOMAIN)
December 2019 - December 2019 (with NXDOMAIN)
November 2019 - November 2019 (with NXDOMAIN)
October 2019 - October 2019 (with NXDOMAIN)
September 2019 - September 2019 (with NXDOMAIN)
August 2019 - August 2019 (with NXDOMAIN)
July 2019 - July 2019 (with NXDOMAIN)
June 2019 - June 2019 (with NXDOMAIN)
May 2019 - May 2019 (with NXDOMAIN)
April 2019 - April 2019 (with NXDOMAIN)
March 2019 - March 2019 (with NXDOMAIN)
February 2019 - February 2019 (with NXDOMAIN)
January 2019 (with NXDOMAIN)
December 2018 (with NXDOMAIN)
November 2018 (with NXDOMAIN)
October 2018 (with NXDOMAIN)
September 2018 (with NXDOMAIN)
August 2018 (with NXDOMAIN)
July 2018 (with NXDOMAIN)
June 2018 (with NXDOMAIN)
May 2018 (with NXDOMAIN)
April 2018 (with NXDOMAIN)
March 2018 (with NXDOMAIN)
February 2018 (with NXDOMAIN)
January 2018 (with NXDOMAIN)
December 2017 (with NXDOMAIN)
November 2017 (with NXDOMAIN)
October 2017 (with NXDOMAIN)
September 2017 (with NXDOMAIN)
August 2017 (with NXDOMAIN)
July 2017 (with NXDOMAIN)



[1] Note that due to an update of the underlying software the number of AS in february is not quite correct. Many AS have been counted double. The ranking itself is not significantly affected by this.
Do you have any questions or suggestions?

Blog article

This short blog article describes the technical background of the ranking in more detail. The underlying infrastructure is explained and the measuring method is discussed in more detail.