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De-Bogonising New Address Blocks Report - 20090407

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Summary

IPv4

Anchor Prefix: 84.205.83.0/24      
Size of set: 62 ASes

Visibility estimation	61 (+- 0) out of 62 ASes (98 %)
Filtering ASes (1)	16150
Uncertain ASes (part of a filtering as-path segment)	0

Visibility estimation	55 (+- 0) out of 62 ASes (88 %)
Filtering ASes (7)	4589 6695 8763 12989 16150 19151 20640
Uncertain ASes (part of a filtering as-path segment)	0

Visibility estimation	55 (+- 0) out of 62 ASes (88 %)
Filtering ASes (7)	4589 6695 8763 12989 16150 19151 20640
Uncertain ASes (part of a filtering as-path segment)	0

Visibility estimation	53 (+- 2) out of 62 ASes (85 %)
Filtering ASes (7)	3356 5413 6695 8763 12989 16150 19151
Uncertain ASes (part of a filtering as-path segment)	4
Filtering segments (at least one filtering AS):	[ 1221 4637 ] [ 4589 5413 ] [ 20640 5413 ]

Visibility estimation	48 (+- 4) out of 62 ASes (77 %)
Filtering ASes (9)	3356 5413 12350 12859 12989 16150 19151 20932 31323
Uncertain ASes (part of a filtering as-path segment)	9
Filtering segments (at least one filtering AS):	[ 286 12859 ] [ 4589 5413 ] [ 6695 12859 ] [ 8763 12859 ] [ 12350 12859 ] [ 12350 3320 ] [ 20640 5413 ] [ 25091 20932 ] [ 29222 286 12859 ] [ 31323 8342 ]

Visibility estimation	48 (+- 4) out of 62 ASes (77 %)
Filtering ASes (9)	3356 5413 12350 12859 12989 16150 19151 20932 31323
Uncertain ASes (part of a filtering as-path segment)	9
Filtering segments (at least one filtering AS):	[ 286 12859 ] [ 4589 5413 ] [ 6695 12859 ] [ 8763 12859 ] [ 12350 12859 ] [ 12350 3320 ] [ 20640 5413 ] [ 25091 20932 ] [ 29222 286 12859 ] [ 31323 8342 ]

Visibility estimation	48 (+- 4) out of 62 ASes (77 %)
Filtering ASes (9)	3356 5413 12350 12859 12989 16150 19151 20932 31323
Uncertain ASes (part of a filtering as-path segment)	9
Filtering segments (at least one filtering AS):	[ 286 12859 ] [ 4589 5413 ] [ 6695 12859 ] [ 8763 12859 ] [ 12350 12859 ] [ 12350 3320 ] [ 20640 5413 ] [ 25091 20932 ] [ 29222 286 12859 ] [ 31323 8342 ]

Visibility estimation	48 (+- 2) out of 62 ASes (77 %)
Filtering ASes (11)	3356 5413 6695 8763 12350 12989 16150 19151 20932 29222 31323
Uncertain ASes (part of a filtering as-path segment)	5
Filtering segments (at least one filtering AS):	[ 4589 5413 ] [ 12350 3320 ] [ 20640 5413 ] [ 25091 20932 ] [ 31323 8342 ]

Visibility estimation	48 (+- 2) out of 62 ASes (77 %)
Filtering ASes (11)	3356 5413 6695 8763 12350 12989 16150 19151 20932 29222 31323
Uncertain ASes (part of a filtering as-path segment)	5
Filtering segments (at least one filtering AS):	[ 4589 5413 ] [ 12350 3320 ] [ 20640 5413 ] [ 25091 20932 ] [ 31323 8342 ]

Visibility estimation	48 (+- 2) out of 62 ASes (77 %)
Filtering ASes (11)	3356 5413 6695 8763 12350 12989 16150 19151 20932 29222 31323
Uncertain ASes (part of a filtering as-path segment)	5
Filtering segments (at least one filtering AS):	[ 4589 5413 ] [ 12350 3320 ] [ 20640 5413 ] [ 25091 20932 ] [ 31323 8342 ]

Details

IPv4 AS Number 41.223.236.0 /22 186.128.0.0 /16 186.127.248.0 /21 197.255.252.0 /22 109.0.0.0 /16 109.1.0.0 /21 109.1.24.0 /24 110.0.0.0 /24 110.50.0.0 /22 110.255.0.0 /16 111.0.0.0 /24 111.50.0.0 /22 111.255.0.0 /16 178.0.0.0 /16 178.1.0.0 /21 178.1.24.0 /24 174 286 513 1221 1239 1299 1853 2497 2578 2895 2914 3257 3269 3320 3356 3549 4589 4608 4637 4777 5392 5413 6453 6667 6695 6762 6939 8331 8342 8359 8402 8447 8596 8763 9002 9942 12350 12637 12779 12859 12956 12989 13237 16150 16735 19089 19151 20640 20932 21202 22548 25091 27664 28917 29222 29449 31323 34347 34695 35054 39792 39821

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.