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De-Bogonising New Address Blocks Report - 20090402

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Summary

IPv4

Anchor Prefix: 84.205.83.0/24      
Size of set: 80 ASes

Visibility estimation	79 (+- 0) out of 80 ASes (98 %)
Filtering ASes (1)	4436
Uncertain ASes (part of a filtering as-path segment)	0

Visibility estimation	74 (+- 0) out of 80 ASes (92 %)
Filtering ASes (6)	2895 4436 8402 28917 31323 39792
Uncertain ASes (part of a filtering as-path segment)	0

Visibility estimation	74 (+- 0) out of 80 ASes (92 %)
Filtering ASes (6)	2895 3491 8402 28917 31323 39792
Uncertain ASes (part of a filtering as-path segment)	0

Visibility estimation	71 (+- 1) out of 80 ASes (88 %)
Filtering ASes (7)	1239 2895 5413 8402 28917 31323 39792
Uncertain ASes (part of a filtering as-path segment)	3
Filtering segments (at least one filtering AS):	[ 3491 19255 ] [ 4436 19255 ]

Visibility estimation	72 (+- 0) out of 80 ASes (90 %)
Filtering ASes (7)	1239 4436 5413 12350 20932 29222 31323
Uncertain ASes (part of a filtering as-path segment)	1
Filtering segments (at least one filtering AS):	[ 25091 20932 ]

Visibility estimation	72 (+- 0) out of 80 ASes (90 %)
Filtering ASes (7)	1239 4436 5413 12350 20932 29222 31323
Uncertain ASes (part of a filtering as-path segment)	1
Filtering segments (at least one filtering AS):	[ 25091 20932 ]

Visibility estimation	72 (+- 0) out of 80 ASes (90 %)
Filtering ASes (7)	1239 4436 5413 12350 20932 29222 31323
Uncertain ASes (part of a filtering as-path segment)	1
Filtering segments (at least one filtering AS):	[ 25091 20932 ]

Visibility estimation	68 (+- 0) out of 80 ASes (85 %)
Filtering ASes (11)	1239 2895 4436 5413 8402 12350 20932 28917 29222 31323 39792
Uncertain ASes (part of a filtering as-path segment)	1
Filtering segments (at least one filtering AS):	[ 25091 20932 ]

Visibility estimation	68 (+- 0) out of 80 ASes (85 %)
Filtering ASes (11)	1239 2895 4436 5413 8402 12350 20932 28917 29222 31323 39792
Uncertain ASes (part of a filtering as-path segment)	1
Filtering segments (at least one filtering AS):	[ 25091 20932 ]

Visibility estimation	68 (+- 0) out of 80 ASes (85 %)
Filtering ASes (11)	1239 2895 4436 5413 8402 12350 20932 28917 29222 31323 39792
Uncertain ASes (part of a filtering as-path segment)	1
Filtering segments (at least one filtering AS):	[ 25091 20932 ]

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 3.5 174 286 513 1103 1125 1221 1239 1299 1853 1930 2119 2497 2895 2914 3257 3269 3333 3356 3491 3549 4436 4589 4608 4637 4777 5392 5413 6453 6667 6695 6762 6881 6939 7018 8331 8359 8402 8447 8596 8763 9002 9304 12350 12637 12779 12859 12956 12989 13237 16150 16186 16735 19089 19151 19255 20562 20640 20771 20932 20965 21202 22548 25091 26943 27664 28917 29222 29449 30132 31323 31477 34347 34695 35054 39792 39821 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.