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De-Bogonising New Address Blocks Report - 20080228

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Summary

IPv4

Anchor Prefix: 84.205.83.0/24      
Size of set: 133 ASes

Visibility estimation	129 (+- 0) out of 133 ASes (96 %)
Filtering ASes (4)	6830 23855 24489 27750
Uncertain ASes (part of a filtering as-path segment)	0

Visibility estimation	127 (+- 3) out of 133 ASes (95 %)
Filtering ASes (3)	3491 25232 27750
Uncertain ASes (part of a filtering as-path segment)	6
Filtering segments (at least one filtering AS):	[ 24490 23855 7660 2907 ] [ 24490 24287 7660 2907 ] [ 24490 24489 24287 7660 2907 ] [ 24490 24489 7660 2907 ]

Visibility estimation	127 (+- 3) out of 133 ASes (95 %)
Filtering ASes (3)	3491 25232 27750
Uncertain ASes (part of a filtering as-path segment)	6
Filtering segments (at least one filtering AS):	[ 24490 23855 7660 2907 ] [ 24490 24287 7660 2907 ] [ 24490 24489 24287 7660 2907 ] [ 24490 24489 7660 2907 ]

Visibility estimation	122 (+- 6) out of 133 ASes (91 %)
Filtering ASes (5)	2607 3491 23352 25232 27750
Uncertain ASes (part of a filtering as-path segment)	12
Filtering segments (at least one filtering AS):	[ 8437 1257 ] [ 12976 3327 ] [ 24490 23855 7660 2907 ] [ 24490 24287 7660 2907 ] [ 24490 24489 24287 7660 2907 ] [ 24490 24489 7660 2907 ] [ 27750 19401 ] [ 27750 20080 19401 ]

Visibility estimation	122 (+- 6) out of 133 ASes (91 %)
Filtering ASes (5)	2607 3491 23352 25232 27750
Uncertain ASes (part of a filtering as-path segment)	12
Filtering segments (at least one filtering AS):	[ 8437 1257 ] [ 12976 3327 ] [ 24490 23855 7660 2907 ] [ 24490 24287 7660 2907 ] [ 24490 24489 24287 7660 2907 ] [ 24490 24489 7660 2907 ] [ 27750 19401 ] [ 27750 20080 19401 ]

Visibility estimation	122 (+- 7) out of 133 ASes (91 %)
Filtering ASes (4)	2607 3491 25232 27750
Uncertain ASes (part of a filtering as-path segment)	14
Filtering segments (at least one filtering AS):	[ 8437 1257 ] [ 12976 3327 ] [ 23352 19255 ] [ 24490 23855 7660 2907 ] [ 24490 24287 7660 2907 ] [ 24490 24489 24287 7660 2907 ] [ 24490 24489 7660 2907 ] [ 27750 19401 ] [ 27750 20080 19401 ]

Visibility estimation	122 (+- 7) out of 133 ASes (91 %)
Filtering ASes (4)	2607 3491 25232 27750
Uncertain ASes (part of a filtering as-path segment)	14
Filtering segments (at least one filtering AS):	[ 8437 1257 ] [ 12976 3327 ] [ 23352 19255 ] [ 24490 23855 7660 2907 ] [ 24490 24287 7660 2907 ] [ 24490 24489 24287 7660 2907 ] [ 24490 24489 7660 2907 ] [ 27750 19401 ] [ 27750 20080 19401 ]

Visibility estimation	122 (+- 7) out of 133 ASes (91 %)
Filtering ASes (4)	2607 3491 25232 27750
Uncertain ASes (part of a filtering as-path segment)	14
Filtering segments (at least one filtering AS):	[ 8437 1257 ] [ 12976 3327 ] [ 23352 19255 ] [ 24490 23855 7660 2907 ] [ 24490 24287 7660 2907 ] [ 24490 24489 24287 7660 2907 ] [ 24490 24489 7660 2907 ] [ 27750 19401 ] [ 27750 20080 19401 ]

Visibility estimation	123 (+- 6) out of 133 ASes (92 %)
Filtering ASes (4)	2607 3491 25232 27750
Uncertain ASes (part of a filtering as-path segment)	12
Filtering segments (at least one filtering AS):	[ 12976 3327 ] [ 23352 19255 ] [ 24490 23855 7660 2907 ] [ 24490 24287 7660 2907 ] [ 24490 24489 24287 7660 2907 ] [ 24490 24489 7660 2907 ] [ 27750 19401 ] [ 27750 20080 19401 ]

Visibility estimation	122 (+- 7) out of 133 ASes (91 %)
Filtering ASes (4)	2607 3491 25232 27750
Uncertain ASes (part of a filtering as-path segment)	14
Filtering segments (at least one filtering AS):	[ 8437 1257 ] [ 12976 3327 ] [ 23352 19255 ] [ 24490 23855 7660 2907 ] [ 24490 24287 7660 2907 ] [ 24490 24489 24287 7660 2907 ] [ 24490 24489 7660 2907 ] [ 27750 19401 ] [ 27750 20080 19401 ]

Visibility estimation	122 (+- 7) out of 133 ASes (91 %)
Filtering ASes (4)	2607 3491 25232 27750
Uncertain ASes (part of a filtering as-path segment)	14
Filtering segments (at least one filtering AS):	[ 8437 1257 ] [ 12976 3327 ] [ 23352 19255 ] [ 24490 23855 7660 2907 ] [ 24490 24287 7660 2907 ] [ 24490 24489 24287 7660 2907 ] [ 24490 24489 7660 2907 ] [ 27750 19401 ] [ 27750 20080 19401 ]

Visibility estimation	122 (+- 7) out of 133 ASes (91 %)
Filtering ASes (4)	2607 3491 25232 27750
Uncertain ASes (part of a filtering as-path segment)	14
Filtering segments (at least one filtering AS):	[ 8437 1257 ] [ 12976 3327 ] [ 23352 19255 ] [ 24490 23855 7660 2907 ] [ 24490 24287 7660 2907 ] [ 24490 24489 24287 7660 2907 ] [ 24490 24489 7660 2907 ] [ 27750 19401 ] [ 27750 20080 19401 ]

Visibility estimation	123 (+- 6) out of 133 ASes (92 %)
Filtering ASes (4)	2607 3491 25232 27750
Uncertain ASes (part of a filtering as-path segment)	12
Filtering segments (at least one filtering AS):	[ 12976 3327 ] [ 23352 19255 ] [ 24490 23855 7660 2907 ] [ 24490 24287 7660 2907 ] [ 24490 24489 24287 7660 2907 ] [ 24490 24489 7660 2907 ] [ 27750 19401 ] [ 27750 20080 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 /16 174 286 513 559 701 702 1103 1221 1239 1257 1273 1280 1299 1853 1916 1930 2118 2119 2200 2497 2516 2607 2828 2852 2907 2914 3216 3257 3269 3320 3327 3333 3356 3491 3549 3741 4230 4589 4608 4637 4777 5392 5413 5511 6067 6453 6461 6667 6762 6830 6881 6939 7018 7575 7660 8167 8220 8331 8359 8402 8419 8434 8437 8447 8468 8596 8631 8928 10429 10764 10910 11537 12124 12350 12779 12793 12859 12956 12976 13237 13645 14361 16034 16150 16186 16467 16735 19089 19255 19401 20080 20483 20485 20562 20932 20965 21202 22548 22691 23352 23855 24287 24489 24490 24963 25091 25232 25462 26104 26943 27319 27664 27750 28895 28917 28929 29208 29222 29449 29636 30126 30132 30844 30912 31283 31323 34102 34245 34347 39196 39202 39792 39912

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.