Hi, Malte. 

Thank you for your quick response and for bringing these measurements to my attention. Conducting traceroutes to an unannounced public IP address is a very clever way to filter out proxies that may respond on its behalf, and seems much more effective than just checking the first hops. I will periodically check the traceroute measurement for evidence of other anomalous probes, and will make note of the probes you mentioned as well when conducting my experiments.

Regards,

William Kanieski

On Mon, Aug 4, 2025 at 9:12 PM Malte Tashiro via ripe-atlas <ripe-atlas@ripe.net> wrote:

Hi William,

adding to this, there are also three probes (63018, 1000963, 1011609) with the same problem.
See this [0] measurement, which targets an IP that is not announced on BGP on purpose [1].
All probes with replies have some issue.

Best,
Malte

[0] https://atlas.ripe.net/measurements/40072013/results
[1] https://github.com/RIPE-Atlas-Community/ripe-atlas-tips-and-tricks/wiki/nonDFZ-Routing
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