A RIPE Atlas probe: a small box on a home connection that runs measurements for the RIPE NCC and anyone with credits. It pings, traces and resolves its way around the internet, around the clock.
The 13 DNS root servers, A to M, from the probe's built-in pings. Most are anycast, so this is the nearest copy of each. Lower is closer.
Median round trip to all root servers, sampled every 15 minutes since this page was set up. Gaps are when the probe was offline.
Tags RIPE Atlas sets by itself, based on the probe's own measurements.