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De-Bogonising New Address Blocks Report - 20071019

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Summary

IPv4

Anchor Prefix: 84.205.83.0/24      
Size of set: 90 ASes

Visibility estimation	85 (+- 0) out of 90 ASes (94 %)
Filtering ASes (5)	1299 1930 16150 24875 27750
Uncertain ASes (part of a filtering as-path segment)	0
Filtering segments (at least one filtering AS):

Visibility estimation	85 (+- 0) out of 90 ASes (94 %)
Filtering ASes (5)	1299 1930 16150 24875 27750
Uncertain ASes (part of a filtering as-path segment)	0
Filtering segments (at least one filtering AS):

Visibility estimation	84 (+- 0) out of 90 ASes (93 %)
Filtering ASes (6)	1299 1930 16150 24875 25232 27750
Uncertain ASes (part of a filtering as-path segment)	0
Filtering segments (at least one filtering AS):

Visibility estimation	81 (+- 1) out of 90 ASes (90 %)
Filtering ASes (8)	1299 1930 2857 12859 16150 20932 25232 27750
Uncertain ASes (part of a filtering as-path segment)	2
Filtering segments (at least one filtering AS):	[ 2914 12859 ] [ 24875 12859 ]

Visibility estimation	81 (+- 1) out of 90 ASes (90 %)
Filtering ASes (8)	1299 1930 2857 12859 16150 20932 25232 27750
Uncertain ASes (part of a filtering as-path segment)	2
Filtering segments (at least one filtering AS):	[ 2914 12859 ] [ 24875 12859 ]

Visibility estimation	75 (+- 1) out of 90 ASes (83 %)
Filtering ASes (13)	2118 2857 3549 6453 7018 7575 8402 8631 8763 11537 14361 24875 25232
Uncertain ASes (part of a filtering as-path segment)	3
Filtering segments (at least one filtering AS):	[ 1916 27750 11537 ] [ 5511 6453 ] [ 7575 11537 ]

Visibility estimation	75 (+- 1) out of 90 ASes (83 %)
Filtering ASes (13)	2118 2857 3549 6453 7018 7575 8402 8631 8763 11537 14361 24875 25232
Uncertain ASes (part of a filtering as-path segment)	3
Filtering segments (at least one filtering AS):	[ 1916 27750 11537 ] [ 5511 6453 ] [ 7575 11537 ]

Details

IPv4 AS Number 41.223.236.0 /22 93.192.0.0 /16 93.255.248.0 /21 95.192.0.0 /16 95.255.248.0 /21 186.128.0.0 /16 186.127.248.0 /21 286 513 1103 1299 1853 1916 1930 2118 2119 2497 2857 2914 3216 3257 3333 3356 3549 3741 4589 4608 4777 5392 5430 5511 6067 6453 6461 6667 6695 6762 6881 7018 7473 7474 7575 8331 8359 8402 8419 8434 8447 8468 8596 8631 8763 8928 10429 11537 12350 12779 12793 12859 12956 12989 13237 13645 14361 15756 16034 16150 16186 20483 20485 20562 20640 20932 20965 21202 22548 22691 24875 24963 25232 25462 26943 27664 27750 28895 28917 29073 29222 29449 29636 30844 31283 33970 34102 34245 34347 39202

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.