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De-Bogonising New Address Blocks Report - 20081018

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Summary

IPv4

Anchor Prefix: 84.205.83.0/24      
Size of set: 132 ASes

Visibility estimation	129 (+- 0) out of 132 ASes (97 %)
Filtering ASes (3)	6730 15703 28809
Uncertain ASes (part of a filtering as-path segment)	0

Visibility estimation	115 (+- 4) out of 132 ASes (87 %)
Filtering ASes (13)	1930 3741 6695 6730 6881 8763 9304 12989 15703 20640 25560 28809 30890
Uncertain ASes (part of a filtering as-path segment)	8
Filtering segments (at least one filtering AS):	[ 3.5 1125 1103 ] [ 4608 1221 4637 ] [ 16186 31283 ]

Visibility estimation	115 (+- 4) out of 132 ASes (87 %)
Filtering ASes (13)	1930 3741 6695 6730 6881 7575 8763 9304 12989 15703 20640 25560 30890
Uncertain ASes (part of a filtering as-path segment)	8
Filtering segments (at least one filtering AS):	[ 3.5 1125 1103 ] [ 4608 1221 4637 ] [ 16186 31283 ]

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 3.5 174 286 513 701 702 1103 1125 1221 1239 1257 1273 1280 1299 1853 1930 2118 2119 2497 2516 2828 2857 2895 2914 3216 3257 3267 3269 3320 3356 3491 3549 3561 3741 4589 4608 4637 4777 5392 5413 5431 5511 6067 6453 6461 6667 6695 6730 6762 6854 6881 6939 7018 7575 8167 8331 8359 8402 8419 8434 8437 8447 8468 8596 8763 8881 8928 9002 9121 9304 10429 12350 12389 12637 12779 12859 12956 12989 13030 13237 14361 15703 16150 16186 16735 17379 19089 19151 19624 20483 20485 20562 20640 20771 20932 20965 21202 22548 22691 25091 25560 26943 27319 27664 28809 28895 28917 28929 29222 29449 29636 30132 30844 30890 31283 31323 31477 34102 34245 34347 34695 34726 35054 39202 39792 39821 39912 41853 41877 41965 42109 44505

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.