At 2025-11-10 17:40:57 UTC Cloudflare for some unknown reason withdrew 2400:cb00:2049::/48, A prefix that contains a lot of DNS name servers for many customers (including bgp.tools) (see https://bgp.tools/prefix/2400:cb00:2049::/48#dns )

Everything was back by 2025-11-10 18:00:30, but it's kinda wild that a prefix that contains .gov and loads of other name servers on it would just disappear like that.

This graph shows a selection of bgp.tools's session visibility second-by-second during the incident.

r1QJmD1F98W213jZZs.png
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