Dear Atlas Hosts and Sponsors, We are pleased to announce the roll-out of user-defined measurements (UDM) for RIPE Atlas. As of today, all hosts and sponsors are invited to run custom measurements. To access UDM, either click on the link at the top right when you are logged in to the RIPE Atlas website, or go directly to: https://atlas.ripe.net/atlas/udm.html Currently, you can schedule two simultaneous measurements to the targets of your choice, from up to 10 probes. You can specify parameters like the area of the probes, IPv4 or IPv6, timing of the measurement, and type (currently ping or traceroute). And you need to have sufficient amount of credits! For the time being, we have created a fairly low rate limit, which we expect to increase over time. More information about limits, credits and other aspects of the UDM system can be found in the documentation: https://atlas.ripe.net/doc/udm Discussion and questions about UDM can be directed to the Atlas mailing list (ripe-atlas@ripe.net). You may also be interested in joining us at the UDM "Birds of a Feather" (BoF) session at RIPE 64 in Ljubljana, on Thursday, 19 April after the Measurements, Analysis and Tools (MAT) Working Group session. https://ripe64.ripe.net/programme/meeting-plan/bof/ Happy measuring! - The RIPE Atlas team ps We have also published a RIPE Labs article about UDM launch: https://labs.ripe.net/Members/becha/ripe-atlas-user-defined-measurements-are...