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The BGP Visibility Scanner
- Subject: The BGP Visibility Scanner
- From: andra.lutu at imdea.org (Andra Lutu)
- Date: Wed, 15 May 2013 12:22:10 +0200
We have built a tool that checks the visibility of IPv4 prefixes at the
The tool is available at *http://visibility.it.uc3m.es/* and you can use
it to retrieve the Limited Visibility Prefixes (LVPs) (i.e., prefixes
that are not present in all the global routing tables we analyse)
injected by a certain originating AS.
The query is very simple, it just requires to input the AS number for
which you want to retrieve the originated LVPs, if any.
After checking the limited-visibility prefixes, we would appreciate any
feedback that you can provide on the cause of the limited visibility (we
provide a form with a few very short questions which you could fill in
Using a dataset from May 2nd 2013, we generated a list with the ASes
which are originating LVPs: *http://visibility.it.uc3m.es/fullASlist.html*
We would like to hear from any operator who might find this project
interesting, and, in particular, from these large contributors to the
Please note that advertising prefixes with limited visibility does not
mean that the originating AS is necessarily doing something wrong.
The ASes might be generating the LVPs knowingly (e.g., scoped
advertisements). However, there might be cases where the origin AS might
be unaware that some prefixes are not globally visible (when they
should) or that others are leaking as a consequence of
Our purpose is to spread awareness about these latter phenomena, help
eliminate the cause of unintended/accidental LVPs and upgrade this tool
to an anomaly detection mechanism.
For more information on the definition and characteristics of a Limited
Visibility prefix, please check the Frequently Asked Questions section
of the webpage, available here:
The tool works with publicly available BGP routing data, retrieved from
the RIPE NCC RIS and RouteViews Projects. The results are updated on a
For more information on the methodology we refer you to the slides of
the NANOG57 presentation about the BGP Visibility Scanner:
Also, you can check the RIPE labs article about the BGP Visibility
Scanner, available here:
We are looking forward to your feedback!
Thank you, best regards,