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De-Bogonising New Address Blocks Report - 20071101

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Summary

IPv4

Anchor Prefix: 84.205.83.0/24      
Size of set: 85 ASes

Visibility estimation	72 (+- 1) out of 85 ASes (84 %)
Filtering ASes (12)	1299 2516 2857 3269 4589 8763 8881 10764 12989 16150 20640 27750
Uncertain ASes (part of a filtering as-path segment)	2
Filtering segments (at least one filtering AS):	[ 6695 5430 ]

Visibility estimation	79 (+- 0) out of 85 ASes (92 %)
Filtering ASes (6)	1299 2516 3269 10764 16150 27750
Uncertain ASes (part of a filtering as-path segment)	0
Filtering segments (at least one filtering AS):

Visibility estimation	79 (+- 0) out of 85 ASes (92 %)
Filtering ASes (6)	1299 2516 3269 10764 16150 27750
Uncertain ASes (part of a filtering as-path segment)	0
Filtering segments (at least one filtering AS):

Visibility estimation	76 (+- 0) out of 85 ASes (89 %)
Filtering ASes (9)	1299 2516 3269 3491 10764 12859 16150 20932 27750
Uncertain ASes (part of a filtering as-path segment)	0
Filtering segments (at least one filtering AS):

Visibility estimation	76 (+- 0) out of 85 ASes (89 %)
Filtering ASes (9)	1299 2516 3269 3491 10764 12859 16150 20932 27750
Uncertain ASes (part of a filtering as-path segment)	0
Filtering segments (at least one filtering AS):

Visibility estimation	76 (+- 0) out of 85 ASes (89 %)
Filtering ASes (9)	2516 3269 3491 5430 7575 8631 8763 16150 27750
Uncertain ASes (part of a filtering as-path segment)	0
Filtering segments (at least one filtering AS):

Visibility estimation	76 (+- 0) out of 85 ASes (89 %)
Filtering ASes (9)	2516 3269 3491 5430 7575 8631 8763 16150 27750
Uncertain ASes (part of a filtering as-path segment)	0
Filtering segments (at least one filtering AS):

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 /21 286 513 559 1103 1280 1299 1853 1916 2119 2497 2516 2857 2914 3269 3333 3356 3491 3549 4589 4777 5392 5430 5511 6067 6453 6461 6667 6695 6762 7575 8167 8331 8359 8419 8434 8447 8468 8596 8631 8763 8881 8928 10429 10764 11537 12350 12779 12793 12859 12956 12989 13237 13645 14361 16034 16150 16467 20483 20485 20562 20640 20932 20965 21202 22548 22691 24963 25232 25462 26943 27664 27750 28895 28917 29073 29222 29449 29636 30844 33970 34102 34245 34347 39196 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.