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De-Bogonising New Address Blocks Report - 20080322

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Summary

IPv4

Anchor Prefix: 84.205.83.0/24      
Size of set: 124 ASes

Visibility estimation	117 (+- 0) out of 124 ASes (94 %)
Filtering ASes (7)	2607 2907 6509 9080 16150 24287 27750
Uncertain ASes (part of a filtering as-path segment)	0

Visibility estimation	115 (+- 2) out of 124 ASes (92 %)
Filtering ASes (7)	2607 6509 9080 16150 22388 25232 27750
Uncertain ASes (part of a filtering as-path segment)	4
Filtering segments (at least one filtering AS):	[ 24490 24287 ] [ 24490 9270 ] [ 25525 25232 ]

Visibility estimation	115 (+- 2) out of 124 ASes (92 %)
Filtering ASes (7)	2607 6509 9080 16150 22388 25232 27750
Uncertain ASes (part of a filtering as-path segment)	4
Filtering segments (at least one filtering AS):	[ 24490 24287 ] [ 24490 9270 ] [ 25525 25232 ]

Visibility estimation	113 (+- 4) out of 124 ASes (91 %)
Filtering ASes (6)	2607 8220 9080 16150 25232 27750
Uncertain ASes (part of a filtering as-path segment)	9
Filtering segments (at least one filtering AS):	[ 8220 16150 ] [ 10764 6509 ] [ 24490 24287 7660 2907 ] [ 24490 9270 7660 22388 ] [ 24490 9270 7660 2907 ] [ 25525 25232 ]

Visibility estimation	112 (+- 4) out of 124 ASes (90 %)
Filtering ASes (7)	2607 3303 8220 9080 16150 25232 27750
Uncertain ASes (part of a filtering as-path segment)	9
Filtering segments (at least one filtering AS):	[ 8220 16150 ] [ 10764 6509 ] [ 24490 24287 7660 2907 ] [ 24490 9270 7660 22388 ] [ 24490 9270 7660 2907 ] [ 25525 25232 ]

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 /21 114.0.0.0 /24 114.50.0.0 /21 114.200.0.0 /19 114.255.0.0 /16 115.0.0.0 /24 115.50.0.0 /21 115.200.0.0 /19 115.255.0.0 /16 174 286 513 559 701 702 1103 1221 1239 1257 1273 1280 1299 1853 1916 1930 2119 2200 2497 2516 2607 2907 2914 3216 3257 3269 3302 3303 3320 3333 3356 3549 3561 3741 4230 4589 4608 4637 4777 5392 5413 5511 6067 6320 6453 6461 6509 6667 6762 6830 6881 6939 7018 7575 7660 8167 8220 8419 8434 8437 8447 8468 8596 8607 8928 9080 9121 9270 10429 10764 11537 12297 12350 12637 12779 12793 12859 12956 13237 13645 14361 16150 16186 16467 19089 20485 20562 20771 20932 20965 21202 22388 22548 22691 24287 24490 24963 25091 25232 25462 25525 27319 27664 27750 28716 28929 29222 29449 29636 30126 30132 30844 30912 31283 34245 34347 34695 39196 39202 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.