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De-Bogonising New Address Blocks Report - 20080511

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Summary

IPv4

Anchor Prefix: 84.205.83.0/24      
Size of set: 144 ASes

Visibility estimation	137 (+- 1) out of 144 ASes (95 %)
Filtering ASes (5)	1239 12389 16150 27750 41965
Uncertain ASes (part of a filtering as-path segment)	3
Filtering segments (at least one filtering AS):	[ 24489 7660 2907 ]

Visibility estimation	138 (+- 2) out of 144 ASes (95 %)
Filtering ASes (4)	1239 16150 23148 27750
Uncertain ASes (part of a filtering as-path segment)	4
Filtering segments (at least one filtering AS):	[ 24490 24489 7660 2907 ]

Visibility estimation	136 (+- 2) out of 144 ASes (94 %)
Filtering ASes (6)	1239 12389 16150 23148 27750 41965
Uncertain ASes (part of a filtering as-path segment)	4
Filtering segments (at least one filtering AS):	[ 24490 24489 7660 2907 ]

Visibility estimation	136 (+- 3) out of 144 ASes (94 %)
Filtering ASes (5)	12793 16150 23148 23352 27750
Uncertain ASes (part of a filtering as-path segment)	6
Filtering segments (at least one filtering AS):	[ 8437 1257 ] [ 24490 24489 7660 2907 ]

Visibility estimation	135 (+- 3) out of 144 ASes (93 %)
Filtering ASes (6)	3303 12793 16150 23148 23352 27750
Uncertain ASes (part of a filtering as-path segment)	6
Filtering segments (at least one filtering AS):	[ 8437 1257 ] [ 24490 24489 7660 2907 ]

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 /21 174 286 513 559 701 702 1103 1221 1239 1257 1273 1280 1299 1853 1916 1930 2118 2119 2497 2516 2857 2895 2907 2914 3058 3216 3257 3267 3269 3303 3333 3356 3491 3549 3741 4230 4436 4589 4608 4637 4777 5392 5413 5430 5511 6067 6453 6461 6667 6695 6762 6881 6939 7018 7575 7660 8167 8220 8331 8359 8365 8402 8419 8434 8437 8447 8468 8596 8631 8763 8881 8928 9002 9121 9304 10429 11537 12350 12389 12637 12779 12793 12859 12956 12989 13237 13645 14361 15412 16150 16186 19089 19151 19255 20144 20483 20562 20640 20771 20932 20965 21202 22548 22691 23148 23352 24489 24490 24963 25091 25152 25232 25560 26943 27664 27750 28895 28917 28929 29208 29222 29449 29636 29686 30126 30132 30844 30890 31283 31323 31477 34102 34245 34347 34695 35054 39196 39202 39792 39912 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.