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De-Bogonising New Address Blocks Report - 20090126

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Summary

IPv4

Anchor Prefix: 84.205.83.0/24      
Size of set: 82 ASes

Visibility estimation	81 (+- 0) out of 82 ASes (98 %)
Filtering ASes (1)	16150
Uncertain ASes (part of a filtering as-path segment)	0

Visibility estimation	81 (+- 0) out of 82 ASes (98 %)
Filtering ASes (1)	16150
Uncertain ASes (part of a filtering as-path segment)	0

Visibility estimation	81 (+- 0) out of 82 ASes (98 %)
Filtering ASes (1)	16150
Uncertain ASes (part of a filtering as-path segment)	0

Details

IPv4 AS Number 41.223.236.0 /22 186.128.0.0 /16 186.127.248.0 /21 197.255.252.1 /22 3.5 174 286 513 1103 1125 1221 1280 1299 1853 1930 2497 2895 2914 3257 3269 3356 3549 4608 4637 4777 5413 6067 6453 6461 6667 6762 6881 6939 7018 8331 8359 8402 8419 8447 8468 8596 9002 9304 12350 12389 12637 12779 12859 12956 13030 13237 14361 16150 16186 16735 19089 19151 20483 20562 20932 20965 21202 22691 25091 26943 27664 28917 29222 29449 29636 30132 30844 31323 31477 34102 34347 34695 35054 39202 39792 39821 39912 41853 41877 41965 42109

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.