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De-Bogonising New Address Blocks Report - 20090219

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Summary

IPv4

Anchor Prefix: 84.205.83.0/24      
Size of set: 87 ASes

Visibility estimation	77 (+- 0) out of 87 ASes (88 %)
Filtering ASes (10)	2857 4589 6695 8763 8881 12989 16150 20640 25560 30890
Uncertain ASes (part of a filtering as-path segment)	0

Visibility estimation	70 (+- 1) out of 87 ASes (80 %)
Filtering ASes (15)	2895 5392 8331 8359 8402 12637 12779 16150 20483 26943 28917 31323 34695 39821 39912
Uncertain ASes (part of a filtering as-path segment)	3
Filtering segments (at least one filtering AS):	[ 29449 3269 ] [ 31477 26943 ]

Visibility estimation	70 (+- 1) out of 87 ASes (80 %)
Filtering ASes (15)	2895 5392 8331 8359 8402 12637 12779 16150 20483 26943 28917 31323 34695 39821 39912
Uncertain ASes (part of a filtering as-path segment)	3
Filtering segments (at least one filtering AS):	[ 29449 3269 ] [ 31477 26943 ]

Visibility estimation	68 (+- 3) out of 87 ASes (78 %)
Filtering ASes (15)	2895 5392 5413 8331 8359 8402 12779 12859 16150 20483 26943 28917 34695 39821 39912
Uncertain ASes (part of a filtering as-path segment)	7
Filtering segments (at least one filtering AS):	[ 12637 174 5413 ] [ 29449 3269 ] [ 30844 5413 ] [ 31323 12859 ] [ 31477 26943 ]

Visibility estimation	78 (+- 1) out of 87 ASes (89 %)
Filtering ASes (8)	2857 5413 8342 12350 13030 16150 20932 29222
Uncertain ASes (part of a filtering as-path segment)	2
Filtering segments (at least one filtering AS):	[ 25091 20932 ] [ 30844 5413 ]

Visibility estimation	78 (+- 1) out of 87 ASes (89 %)
Filtering ASes (8)	2857 5413 8342 12350 13030 16150 20932 29222
Uncertain ASes (part of a filtering as-path segment)	2
Filtering segments (at least one filtering AS):	[ 25091 20932 ] [ 30844 5413 ]

Visibility estimation	78 (+- 1) out of 87 ASes (89 %)
Filtering ASes (8)	2857 5413 8342 12350 13030 16150 20932 29222
Uncertain ASes (part of a filtering as-path segment)	2
Filtering segments (at least one filtering AS):	[ 25091 20932 ] [ 30844 5413 ]

Visibility estimation	64 (+- 5) out of 87 ASes (73 %)
Filtering ASes (18)	2895 5392 5413 8331 8342 8402 12779 12859 13030 16150 20483 20932 26943 28917 29222 34695 39821 39912
Uncertain ASes (part of a filtering as-path segment)	10
Filtering segments (at least one filtering AS):	[ 2857 12859 ] [ 12350 12859 ] [ 12637 174 5413 ] [ 25091 20932 ] [ 29449 3269 ] [ 30844 5413 ] [ 31323 12859 ] [ 31477 26943 ]

Visibility estimation	64 (+- 5) out of 87 ASes (73 %)
Filtering ASes (18)	2895 5392 5413 8331 8342 8402 12779 12859 13030 16150 20483 20932 26943 28917 29222 34695 39821 39912
Uncertain ASes (part of a filtering as-path segment)	10
Filtering segments (at least one filtering AS):	[ 2857 12859 ] [ 12350 12859 ] [ 12637 174 5413 ] [ 25091 20932 ] [ 29449 3269 ] [ 30844 5413 ] [ 31323 12859 ] [ 31477 26943 ]

Visibility estimation	64 (+- 5) out of 87 ASes (73 %)
Filtering ASes (18)	2895 5392 5413 8331 8342 8402 12779 12859 13030 16150 20483 20932 26943 28917 29222 34695 39821 39912
Uncertain ASes (part of a filtering as-path segment)	10
Filtering segments (at least one filtering AS):	[ 2857 12859 ] [ 12350 12859 ] [ 12637 174 5413 ] [ 25091 20932 ] [ 29449 3269 ] [ 30844 5413 ] [ 31323 12859 ] [ 31477 26943 ]

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 1280 1299 1853 1930 2497 2857 2895 2914 3257 3269 3356 3549 4589 4608 4637 4777 5392 5413 6067 6453 6461 6695 6762 6881 6939 7018 8331 8342 8359 8402 8419 8447 8468 8596 8763 8881 9002 9304 12350 12389 12637 12779 12859 12956 12989 13030 13237 14361 16150 16186 16735 19089 19151 20483 20562 20640 20932 20965 22691 25091 25560 26943 27664 28917 29222 29449 29636 30132 30844 30890 31323 31477 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.