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De-Bogonising New Address Blocks Report - 20080413

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Summary

IPv4

Anchor Prefix: 84.205.83.0/24      
Size of set: 112 ASes

Visibility estimation	107 (+- 0) out of 112 ASes (95 %)
Filtering ASes (4)	6509 9009 12301 27750
Uncertain ASes (part of a filtering as-path segment)	1
Filtering segments (at least one filtering AS):	[ 27750 19401 ]

Visibility estimation	108 (+- 0) out of 112 ASes (96 %)
Filtering ASes (3)	6509 9009 27750
Uncertain ASes (part of a filtering as-path segment)	1
Filtering segments (at least one filtering AS):	[ 27750 19401 ]

Visibility estimation	107 (+- 0) out of 112 ASes (95 %)
Filtering ASes (4)	6509 9009 12301 27750
Uncertain ASes (part of a filtering as-path segment)	1
Filtering segments (at least one filtering AS):	[ 27750 19401 ]

Visibility estimation	106 (+- 1) out of 112 ASes (94 %)
Filtering ASes (4)	6509 9009 12301 27750
Uncertain ASes (part of a filtering as-path segment)	3
Filtering segments (at least one filtering AS):	[ 8437 1257 ] [ 27750 19401 ]

Visibility estimation	104 (+- 2) out of 112 ASes (92 %)
Filtering ASes (5)	3303 6509 9009 12301 27750
Uncertain ASes (part of a filtering as-path segment)	5
Filtering segments (at least one filtering AS):	[ 8437 1257 ] [ 12389 8359 ] [ 27750 19401 ]

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 1103 1221 1239 1257 1273 1280 1299 1853 1916 1930 2119 2497 2516 2914 3257 3269 3303 3320 3333 3356 3549 3741 4230 4608 4637 4777 5392 5413 5511 6067 6320 6453 6461 6509 6667 6762 6881 6939 7018 7575 8167 8220 8359 8419 8434 8437 8447 8468 8596 8607 8928 9009 9121 10429 10764 11537 12301 12350 12389 12637 12779 12793 12859 12956 13237 13645 14361 16150 16186 16467 19089 19255 19401 20485 20562 20771 20932 20965 21202 22548 22691 24963 25091 25462 26943 27664 27750 28929 29208 29222 29449 29636 30126 30132 30844 31283 34245 34347 34695 35054 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.