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De-Bogonising New Address Blocks Report - 20080211

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Summary

IPv4

Anchor Prefix: 84.205.83.0/24      
Size of set: 63 ASes

Visibility estimation	58 (+- 0) out of 63 ASes (92 %)
Filtering ASes (4)	1930 3356 12859 27750
Uncertain ASes (part of a filtering as-path segment)	1
Filtering segments (at least one filtering AS):	[ 286 12859 ]

Visibility estimation	58 (+- 0) out of 63 ASes (92 %)
Filtering ASes (4)	1930 3356 12859 27750
Uncertain ASes (part of a filtering as-path segment)	1
Filtering segments (at least one filtering AS):	[ 286 12859 ]

Visibility estimation	58 (+- 0) out of 63 ASes (92 %)
Filtering ASes (4)	1930 3356 12859 27750
Uncertain ASes (part of a filtering as-path segment)	1
Filtering segments (at least one filtering AS):	[ 286 12859 ]

Visibility estimation	58 (+- 0) out of 63 ASes (92 %)
Filtering ASes (4)	1930 8928 12859 27750
Uncertain ASes (part of a filtering as-path segment)	1
Filtering segments (at least one filtering AS):	[ 286 12859 ]

Visibility estimation	58 (+- 0) out of 63 ASes (92 %)
Filtering ASes (4)	1930 8928 12859 27750
Uncertain ASes (part of a filtering as-path segment)	1
Filtering segments (at least one filtering AS):	[ 286 12859 ]

Visibility estimation	58 (+- 0) out of 63 ASes (92 %)
Filtering ASes (4)	1930 8928 12859 27750
Uncertain ASes (part of a filtering as-path segment)	1
Filtering segments (at least one filtering AS):	[ 286 12859 ]

Visibility estimation	58 (+- 0) out of 63 ASes (92 %)
Filtering ASes (4)	1930 8928 12859 27750
Uncertain ASes (part of a filtering as-path segment)	1
Filtering segments (at least one filtering AS):	[ 286 12859 ]

Visibility estimation	58 (+- 0) out of 63 ASes (92 %)
Filtering ASes (4)	1930 8928 12859 27750
Uncertain ASes (part of a filtering as-path segment)	1
Filtering segments (at least one filtering AS):	[ 286 12859 ]

Visibility estimation	58 (+- 0) out of 63 ASes (92 %)
Filtering ASes (4)	1930 8928 12859 27750
Uncertain ASes (part of a filtering as-path segment)	1
Filtering segments (at least one filtering AS):	[ 286 12859 ]

Visibility estimation	58 (+- 0) out of 63 ASes (92 %)
Filtering ASes (4)	1930 8928 12859 27750
Uncertain ASes (part of a filtering as-path segment)	1
Filtering segments (at least one filtering AS):	[ 286 12859 ]

Visibility estimation	58 (+- 0) out of 63 ASes (92 %)
Filtering ASes (4)	1930 8928 12859 27750
Uncertain ASes (part of a filtering as-path segment)	1
Filtering segments (at least one filtering AS):	[ 286 12859 ]

Visibility estimation	58 (+- 0) out of 63 ASes (92 %)
Filtering ASes (4)	1930 8928 12859 27750
Uncertain ASes (part of a filtering as-path segment)	1
Filtering segments (at least one filtering AS):	[ 286 12859 ]

Visibility estimation	58 (+- 0) out of 63 ASes (92 %)
Filtering ASes (4)	1930 8928 12859 27750
Uncertain ASes (part of a filtering as-path segment)	1
Filtering segments (at least one filtering AS):	[ 286 12859 ]

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 /21 114.0.0.0 /24 114.50.0.0 /21 114.200.0.0 /19 114.255.0.0 /16 115.0.0.0 /24 115.50.0.0 /21 115.200.0.0 /19 115.255.0.0 /16 286 513 1103 1221 1280 1299 1916 1930 2118 2497 2914 3257 3333 3356 3549 3741 4608 4637 4777 5392 5413 6453 6461 6881 6939 7018 7575 8167 8331 8359 8402 8631 8928 10429 11537 12350 12779 12859 12956 14361 16186 16467 16735 19089 20483 20932 20965 22548 25091 25462 27664 27750 28895 28917 28929 29222 29449 30132 31283 31323 34102 39792 39912

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.