[SANOG] Is there a way to check whether any particular segment was ever announced to the Internet

[Rahul Makhija]

Hi Gaurav,

There are route-collectors hosted publicly that do keep record of BGP
advertisements. I just checked the given prefix on one such service
provided by RIPE NCC
<https://stat.ripe.net/widget/routing-history#w.resource=240e:2000::/19>
and found that the given prefix has been announced from any ASN.

The only relevant announcement recorded after 2018 is by AS9498, but that
is for the complete 2400::/12. I would consider that as a route leak
instead of a valid announcement.

Thank you.
Rahul
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