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De-Bogonising New Address Blocks Report - 20070418

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Summary

Anchor Prefix: 84.205.83.0/24
Size of set: 86 ASes

Visibility estimation	80 (+- 2) out of 86 ASes (93 %)
Filtering ASes (3)	2516 11537 16150
Uncertain ASes (part of a filtering as-path segment)	5
Filtering segments (at least one filtering AS):	[1916 27750 11537] [8928 25232]

Visibility estimation	78 (+- 3) out of 86 ASes (90 %)
Filtering ASes (4)	2857 11537 16150 20932
Uncertain ASes (part of a filtering as-path segment)	7
Filtering segments (at least one filtering AS):	[1916 27750 11537] [3491 26943] [8928 25232]

Visibility estimation	78 (+- 3) out of 86 ASes (90 %)
Filtering ASes (4)	2857 11537 16150 20932
Uncertain ASes (part of a filtering as-path segment)	7
Filtering segments (at least one filtering AS):	[1916 27750 11537] [3491 26943] [8928 25232]

Visibility estimation	78 (+- 3) out of 86 ASes (90 %)
Filtering ASes (4)	2857 11537 16150 20932
Uncertain ASes (part of a filtering as-path segment)	7
Filtering segments (at least one filtering AS):	[1916 27750 11537] [3491 26943] [8928 25232]

Visibility estimation	78 (+- 3) out of 86 ASes (90 %)
Filtering ASes (4)	2857 11537 16150 20932
Uncertain ASes (part of a filtering as-path segment)	7
Filtering segments (at least one filtering AS):	[1916 27750 11537] [3491 26943] [8928 25232]

Details

AS Number	41.223.236.0 /22	92.192.0.0 /16	92.255.248.0 /21	93.192.0.0 /16	93.255.248.0 /21
286
513
1103
1221
1299
1853
1916
2497
2516
2857
3257
3267
3277
3333
3343
3356
3491
3549
3741
4589
4608
4637
4777
5392
5417
5511
6067
6453
6461
6667
6695
6762
6881
7018
7575
8167
8331
8359
8419
8434
8447
8468
8596
8631
8763
8928
10429
11537
12350
12654
12779
12793
12859
12956
12976
13237
13645
14361
15837
16034
16150
16186
19401
20483
20485
20562
20640
20932
20965
21202
22548
22691
25232
25462
26943
27664
27750
28895
28917
29222
29636
30844
31283
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.