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Visibility of Prefix Lengths in IPv4 and IPv6
Visibility of Prefix Lengths in IPv4 and IPv6
Devin Bayer — Oct 10, 2010 01:00 PM

In this article we explore the relation between global network visibility as seen by the Routing Information Service (RIS) and the length of announced prefixes.

Interesting Graph - IPv4 Unassigned
Mirjam Kühne — Oct 08, 2010 05:21 PM

With the IPv4 address space nearing its end, we are closely monitoring the number of address not yet assigned or allocated. See below one way of measuring them.

Wanted: Partners to Sponsor "RIPE Atlas" Effort
Daniel Karrenberg — Oct 08, 2010 04:55 PM

This is the next in a series of articles about the new active measurements network, which now has a name: "RIPE Atlas". In this article I will describe the current planning for the pilot. This is also a call for sponsors which will be needed to make the measurement network really big.

Background Radiation in IPv6
Mirjam Kühne — Oct 04, 2010 06:25 PM

Geoff Huston investigated to what extent the IPv6 Internet is polluted by "background radiation". Find below some interesting results and observations.

Tony McGregor — Sep 24, 2010 01:05 PM

This data is a set of active measurements (ping/traceroute) collected by the NLANR research group. The data consists of measurements in a mesh of up to 130 vantage points and the measurements ran between 1998 and 2006. This data is useful for longitudinal study of the Internet. The data available from the RIPE Data Repository is a remastered version of the original data that was available from the NLANR website.

iPlane traceroute Dataset
Harsha V. Madhyastha — Sep 23, 2010 07:50 PM

This dataset contains traceroutes from PlanetLab nodes and traceroute servers that are done as part of the iPlane project at the University of Washington. This data starts 2006-06-23 and is updated daily. The data hosted on the Data Repository is a copy of the original data that is hosted at the University of Washington, but the historical logs are remastered so they contain only a single tarball per day. Additional data gathered by iPlane such as link latency and loss measurements as well as processed versions of the traceroutes are available at

BGP Route Origin Validation - A follow-up
David Murray — Sep 22, 2010 12:00 AM

In July 2010 we looked at the effects of BGP route origin validation on mis-announcements and hijackings. In the meantime, we did some research based on comments and questions received by the community. The findings are described in this follow-up article.

An Investigation with RIPE NCC Tools
Daniel Karrenberg — Sep 20, 2010 10:00 AM

After a short service outage, I was interested to find out what happened. Please find below a case study for using public RIPE NCC Tools for this purpose.

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