RIPE Atlas Islands and Peninsulas

Every day ANT project analyzes the RIPE Atlas data and determines islands and peninsulas among RIPE Atlas anchors with respect to DNS Roots. Islands are probes that consistently cannot reach any of the 13 letters of the DNS Roots, and peninsulas are exhibiting partial connectivity and can reach some but not others.

This information is generated at the end of the day (24 hour period, UTC) and provided as-is in the hope of being useful to RIPE Atlas, DNS Root operators, as well as individual probe operators.

We provide IPv4 and IPv6, islands and peninsulas, in JSON and Fsdb format (Fsdb is tab-separated value with a header). Both list the RIPE Atlas Probe ID as the location. Peninsulas show a list of letters A through M, representing reachability to each root identifier, with uppercase letters indicating reachable and lowercase indicating unreachable (so AbCDEFGHIJKLM is an Atlas VP on a peninusla where only B-Root cannot be reached).