Dear All, We've observed recently that some users are using scripts to "crawl" through all the metadata provided by the probe and measurement APIs. This means that some people out there download basically the entire probe and/or measurement meta data set the system provides. As you can imagine, this is highly inefficient and keeps our servers busy. We believe that there could be better solutions. We have been providing the downloadable archive for probe metadata for some time now, and recently we've added the measurement metadata too. You can now reach these at http://ftp.ripe.net/ripe/atlas/ This way one can even get complete sets of metadata as far back as January 2015 for measurement specifications and March 2014 for probe data. Given the existence of these archives, we will apply a sane limit on how much metadata can be reached via the APIs. In practice this means that the API will not allow fetching results beyond, say, 10.000 (i.e. 500 pages of 20) entries. This is after the application of filters, so for example with no filters at all you could still access metadata of the 10k newest measurements, while if you filter for DNS measurements only, you could get the 10k newest of those, and so on. We believe this keeps the metadata API useful for the majority of the users, while the existence of the archive serves the remaining cases. Our plan is to make this change around the end of July. Regards, Robert Kisteleki