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De-Bogonising New Address Blocks Report - 20080603

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Summary

IPv4

Anchor Prefix: 84.205.83.0/24      
Size of set: 68 ASes

Visibility estimation	65 (+- 0) out of 68 ASes (95 %)
Filtering ASes (2)	11537 16150
Uncertain ASes (part of a filtering as-path segment)	1
Filtering segments (at least one filtering AS):	[ 1239 16150 ]

Visibility estimation	65 (+- 0) out of 68 ASes (95 %)
Filtering ASes (2)	11537 16150
Uncertain ASes (part of a filtering as-path segment)	1
Filtering segments (at least one filtering AS):	[ 1239 16150 ]

Visibility estimation	65 (+- 0) out of 68 ASes (95 %)
Filtering ASes (2)	11537 16150
Uncertain ASes (part of a filtering as-path segment)	1
Filtering segments (at least one filtering AS):	[ 1239 16150 ]

Visibility estimation	64 (+- 0) out of 68 ASes (94 %)
Filtering ASes (3)	11537 12793 16150
Uncertain ASes (part of a filtering as-path segment)	1
Filtering segments (at least one filtering AS):	[ 1239 16150 ]

Visibility estimation	64 (+- 0) out of 68 ASes (94 %)
Filtering ASes (3)	11537 12793 16150
Uncertain ASes (part of a filtering as-path segment)	1
Filtering segments (at least one filtering AS):	[ 1239 16150 ]

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 /16 286 1103 1221 1239 1299 1853 1930 2497 2516 2914 3257 3356 3549 3741 4608 4637 4777 5413 5511 6067 6453 6461 6667 6762 6881 6939 7018 8419 8434 8447 8468 8596 8631 9002 9121 9304 11537 12301 12389 12793 12859 13237 13645 14361 16150 16186 19151 20771 20932 20965 21202 22691 24963 26943 29636 30126 30132 30844 31283 34245 34347 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.