Ray,

Thanks, it's a nice service to the community to try to clean this up.

I was about to reply that it looked like the default location, but you've been able to confirm that in the meantime.

I noticed two papers recently that did this sort of cleaning. Pointing them out in case it's helpful:
1. https://hal.science/hal-04215113v2/file/geolocation-reproducibility-paper.pdf

In Section 4.3, this paper identifies RIPE Atlas probes that (based on the claimed location) led to pings violating the speed of light, in order to prune the ones they use to be more trustworthy. They flagged 9 anchors and 96 normal probes.

2. This paper looked specifically at the question of RIPE Atlas geolocations:

https://arxiv.org/abs/2409.19109

They shared results on violating probes here (the paper also has a link for the measurements), and it looks like it was updated as recently as last week
https://github.com/kizhikevich/violating_ripe_probes

I'll also forward your thread to some of the authors of both papers, in case they have more to add.

Ethan

On Mon, Jul 7, 2025 at 11:36 AM Ray Bellis <ray@isc.org> wrote:

On 2025/07/07 16: 27, Ray Bellis wrote: > I had meant to include a screenshot. The location is approx 37. 75N, 97. 82W I received a reply off-list indicating that this is the MaxMind default location for the US: https: //urldefense. proofpoint. com/v2/url?u=https-3A__en. wikipedia. org_wiki_MaxMind-23Kansas-5Fglitch&d=DwIGaQ&c=009klHSCxuh5AI1vNQzSO0KGjl4nbi2Q0M1QLJX9BeE&r=6ttVGscz_Aloa7TJZDIaFYXAH8LXd2R9zt0BYA0qof0&m=nqi5k-5PADBIDPHTSIkyCHBlY0DMGD_SPgVWh152Ok5g_kOroxOHawuGxogU3Uzs&s=Cf2WVpyBqtKYqiUHLkSDLBoDOONVkjaY64DoXoaHHos&e=

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On 2025/07/07 16:27, Ray Bellis wrote:

> I had meant to include a screenshot.  The location is approx 37.75N, 97.82W

I received a reply off-list indicating that this is the MaxMind default 
location for the US:

https://urldefense.proofpoint.com/v2/url?u=https-3A__en.wikipedia.org_wiki_MaxMind-23Kansas-5Fglitch&d=DwIGaQ&c=009klHSCxuh5AI1vNQzSO0KGjl4nbi2Q0M1QLJX9BeE&r=6ttVGscz_Aloa7TJZDIaFYXAH8LXd2R9zt0BYA0qof0&m=nqi5k-5PADBIDPHTSIkyCHBlY0DMGD_SPgVWh152Ok5g_kOroxOHawuGxogU3Uzs&s=Cf2WVpyBqtKYqiUHLkSDLBoDOONVkjaY64DoXoaHHos&e=

I've had a probe myself for so long that I didn't realise you could 
install one without manually supplying a more accurate location.

Ray

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