UCSD & UCLA

SOI Checker

Check whether a RIPE Atlas probe's reported location is inconsistent with latency to root-server instances. Daily results use the minimum RTT observed across the scheduled 06:00, 12:00, and 18:00 UTC snapshots available for that day. For more details about methodology, see our paper.

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RIPE Atlas probe ID Look back

days

100 km tolerance Paper default Require ≥2 root letters Paper default

Days with data —

Violating days —

Roots observed —

Latest day's snapshots —

Where does it violate?

Violating root letters —

Largest violation margin —

Date	Root	Root instance	Min RTT snapshot (UTC)	RTT (ms)	Distance (km)	Max feasible (km)	Beyond threshold (km)

Probe and violating root-instance locations

World overview of the probe's reported location and violating root-server instances.

Reported probe location Violating root-server instance

Show daily rule counts

Date	Violating letters (0 km)	Violating letters (100 km)	Roots observed	Snapshots used