All comments and suggestions to improve our tools are welcome, please let us know.

De-Bogonising New Address Blocks Report - 20080914

Previous day's report | Next day's report | Monthly view

Summary

IPv4

Anchor Prefix: 84.205.83.0/24      
Size of set: 51 ASes

Visibility estimation	51 (+- 0) out of 51 ASes (100 %)
Filtering ASes (0)
Uncertain ASes (part of a filtering as-path segment)	0

Visibility estimation	51 (+- 0) out of 51 ASes (100 %)
Filtering ASes (0)
Uncertain ASes (part of a filtering as-path segment)	0

Visibility estimation	51 (+- 0) out of 51 ASes (100 %)
Filtering ASes (0)
Uncertain ASes (part of a filtering as-path segment)	0

Visibility estimation	51 (+- 0) out of 51 ASes (100 %)
Filtering ASes (0)
Uncertain ASes (part of a filtering as-path segment)	0

Visibility estimation	51 (+- 0) out of 51 ASes (100 %)
Filtering ASes (0)
Uncertain ASes (part of a filtering as-path segment)	0

Details

IPv4 AS Number 41.223.236.0 /22 95.192.0.0 /16 95.255.248.0 /21 186.128.0.0 /16 186.127.248.0 /21 112.0.0.0 /24 112.50.0.0 /21 112.255.0.0 /16 113.0.0.0 /24 113.50.0.0 /21 113.255.0.0 /16 174 286 1239 1299 1853 2119 2914 3257 3269 3356 3549 5392 5413 6453 6667 6762 6881 6939 8434 8447 8596 9002 9121 12637 12779 12859 12956 13237 16150 16735 19089 20562 20771 20932 21202 22548 24963 26943 27664 28929 29449 30126 30132 31477 34347 34695 39912 41877 42109 44334 44505

Methodology

The anchor and debogon prefixes are announced by the same router (RRC3) and AS number (AS12654). The AS-path from any point on the Internet towards the announcing router should therefore be the same for both prefixes. If this is not the case, it is assumed that debogon prefix filtering is being applied somewhere on the path.

The collection points of the AS-paths used in this report are all the RIS RRCs. Therefore, ASes covered in this report are only those seen in the AS-paths between the collection points and the anchor prefix.

To perform this report, all the AS-paths towards the anchor and the debogon prefixes are compared:

• ASes appearing on matching anchor and debogon paths are labelled non-filtering.
• From the unmatching AS-paths, all ASes labeled as non-filtering are removed, generating a list of AS-path segments.
• If a segment consists of only one AS, the AS is labelled filtering.
• All remaining ASes are labelled uncertain.

If an AS is labelled uncertain, it means that it is part of an AS-path segment in which at least one AS is considered to be filtering, but it is unconclusive which one(s).

The visibility plots show the percentage of how many ASes are estimated to be non-filtering. The grey area represents the indeterminacy caused by the ASes considered uncertain.