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De-Bogonising New Address Blocks Report - 20080907

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Summary

IPv4

Anchor Prefix: 84.205.83.0/24      
Size of set: 104 ASes

Visibility estimation	103 (+- 0) out of 104 ASes (99 %)
Filtering ASes (1)	2118
Uncertain ASes (part of a filtering as-path segment)	0

Visibility estimation	103 (+- 0) out of 104 ASes (99 %)
Filtering ASes (1)	2118
Uncertain ASes (part of a filtering as-path segment)	0

Visibility estimation	103 (+- 0) out of 104 ASes (99 %)
Filtering ASes (1)	2118
Uncertain ASes (part of a filtering as-path segment)	0

Visibility estimation	91 (+- 6) out of 104 ASes (87 %)
Filtering ASes (6)	1930 2118 3741 6881 7018 9304
Uncertain ASes (part of a filtering as-path segment)	13
Filtering segments (at least one filtering AS):	[ 3.5 1125 1103 ] [ 4608 1221 4637 ] [ 16186 31283 ] [ 42109 44505 41877 20771 9121 ]

Visibility estimation	91 (+- 6) out of 104 ASes (87 %)
Filtering ASes (6)	1930 2118 3741 6881 7018 9304
Uncertain ASes (part of a filtering as-path segment)	13
Filtering segments (at least one filtering AS):	[ 3.5 1125 1103 ] [ 4608 1221 4637 ] [ 16186 31283 ] [ 42109 44505 41877 20771 9121 ]

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 3.5 286 513 1103 1125 1221 1239 1280 1299 1853 1930 2118 2119 2497 2516 2857 2895 2914 3257 3269 3356 3549 3741 4589 4608 4637 4777 5392 5413 5430 6453 6461 6667 6695 6762 6881 6939 7018 7575 8331 8359 8402 8434 8447 8596 8631 8763 8881 9002 9121 9304 12350 12637 12779 12859 12956 12989 13030 13237 14361 16150 16186 16735 19089 19151 20483 20562 20640 20771 20932 20965 21202 22548 22691 24963 25091 25560 26943 27664 28895 28917 28929 29222 29449 30126 30132 30890 31283 31323 31477 34102 34245 34347 34695 35054 39202 39792 39821 39912 41853 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.