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De-Bogonising New Address Blocks Report - 20080617

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Summary

IPv4

Anchor Prefix: 84.205.83.0/24      
Size of set: 79 ASes

Visibility estimation	77 (+- 0) out of 79 ASes (97 %)
Filtering ASes (2)	16150 27750
Uncertain ASes (part of a filtering as-path segment)	0

Visibility estimation	74 (+- 1) out of 79 ASes (93 %)
Filtering ASes (3)	16150 26943 27750
Uncertain ASes (part of a filtering as-path segment)	3
Filtering segments (at least one filtering AS):	[ 29073 20562 ] [ 31477 26943 ]

Visibility estimation	74 (+- 1) out of 79 ASes (93 %)
Filtering ASes (3)	16150 26943 27750
Uncertain ASes (part of a filtering as-path segment)	3
Filtering segments (at least one filtering AS):	[ 29073 20562 ] [ 31477 26943 ]

Visibility estimation	63 (+- 2) out of 79 ASes (79 %)
Filtering ASes (13)	2857 2914 4589 6762 8763 8881 12793 12989 16150 20640 26943 27750 30890
Uncertain ASes (part of a filtering as-path segment)	5
Filtering segments (at least one filtering AS):	[ 6695 5430 ] [ 29073 20562 ] [ 31477 26943 ]

Visibility estimation	63 (+- 2) out of 79 ASes (79 %)
Filtering ASes (13)	2857 2914 4589 6762 8763 8881 12793 12989 16150 20640 26943 27750 30890
Uncertain ASes (part of a filtering as-path segment)	5
Filtering segments (at least one filtering AS):	[ 6695 5430 ] [ 29073 20562 ] [ 31477 26943 ]

Visibility estimation	64 (+- 2) out of 79 ASes (81 %)
Filtering ASes (12)	701 1273 2857 3257 5413 12350 12859 16150 20932 25091 26943 29073
Uncertain ASes (part of a filtering as-path segment)	5
Filtering segments (at least one filtering AS):	[ 1916 27750 11537 ] [ 7575 11537 ] [ 31477 26943 ]

Visibility estimation	64 (+- 2) out of 79 ASes (81 %)
Filtering ASes (12)	701 1273 2857 3257 5413 12350 12859 16150 20932 25091 26943 29073
Uncertain ASes (part of a filtering as-path segment)	5
Filtering segments (at least one filtering AS):	[ 1916 27750 11537 ] [ 7575 11537 ] [ 31477 26943 ]

Visibility estimation	64 (+- 2) out of 79 ASes (81 %)
Filtering ASes (12)	701 1273 2857 3257 5413 12350 12859 16150 20932 25091 26943 29073
Uncertain ASes (part of a filtering as-path segment)	5
Filtering segments (at least one filtering AS):	[ 1916 27750 11537 ] [ 7575 11537 ] [ 31477 26943 ]

Visibility estimation	64 (+- 2) out of 79 ASes (81 %)
Filtering ASes (12)	701 1273 2857 3257 5413 12350 12859 16150 20932 25091 26943 29073
Uncertain ASes (part of a filtering as-path segment)	5
Filtering segments (at least one filtering AS):	[ 1916 27750 11537 ] [ 7575 11537 ] [ 31477 26943 ]

Visibility estimation	64 (+- 2) out of 79 ASes (81 %)
Filtering ASes (12)	701 1273 2857 3257 5413 12350 12859 16150 20932 25091 26943 29073
Uncertain ASes (part of a filtering as-path segment)	5
Filtering segments (at least one filtering AS):	[ 1916 27750 11537 ] [ 7575 11537 ] [ 31477 26943 ]

Visibility estimation	64 (+- 2) out of 79 ASes (81 %)
Filtering ASes (12)	701 1273 2857 3257 5413 12350 12859 16150 20932 25091 26943 29073
Uncertain ASes (part of a filtering as-path segment)	5
Filtering segments (at least one filtering AS):	[ 1916 27750 11537 ] [ 7575 11537 ] [ 31477 26943 ]

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 /16 286 513 701 1103 1273 1280 1299 1853 1916 2118 2497 2857 2895 2914 3216 3257 3267 3356 3549 4230 4589 4777 5413 5430 6453 6461 6667 6695 6762 6939 7575 8331 8434 8447 8596 8631 8763 8881 9002 11537 12350 12793 12859 12956 12989 13237 13645 14361 16150 16735 19089 19151 20483 20562 20640 20932 21202 22548 22691 24963 25091 25560 26943 27664 27750 28895 28917 29073 29222 30126 30132 30890 31477 34102 34347 35054 39196 39821 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.