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De-Bogonising New Address Blocks Report - 20070317

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Summary

Anchor Prefix: 84.205.83.0/24
Size of set: 145 ASes

Visibility estimation	139 (+- 1) out of 145 ASes (95 %)
Filtering ASes (5)	2852 6939 8195 8220 24489
Uncertain ASes (part of a filtering as-path segment)	2
Filtering segments (at least one filtering AS):	[4538 24489 24287]

Visibility estimation	135 (+- 2) out of 145 ASes (93 %)
Filtering ASes (7)	2852 2857 3491 6939 8195 8220 19401
Uncertain ASes (part of a filtering as-path segment)	5
Filtering segments (at least one filtering AS):	[2857 3491] [3303 19401] [4230 3491] [6939 3491] [21385 3491] [65000 65001 19401]

Visibility estimation	135 (+- 2) out of 145 ASes (93 %)
Filtering ASes (7)	2852 2857 3491 6939 8195 8220 19401
Uncertain ASes (part of a filtering as-path segment)	5
Filtering segments (at least one filtering AS):	[2857 3491] [3303 19401] [4230 3491] [6939 3491] [21385 3491] [65000 65001 19401]

Visibility estimation	133 (+- 3) out of 145 ASes (91 %)
Filtering ASes (8)	2852 2857 3491 6939 8195 8220 19401 24489
Uncertain ASes (part of a filtering as-path segment)	7
Filtering segments (at least one filtering AS):	[2857 3491] [3303 19401] [4230 3491] [4538 24489 24287 19401] [6939 3491] [21385 3491] [65000 65001 19401]

Visibility estimation	135 (+- 2) out of 145 ASes (93 %)
Filtering ASes (7)	2852 2857 3491 6939 8195 8220 19401
Uncertain ASes (part of a filtering as-path segment)	5
Filtering segments (at least one filtering AS):	[2857 3491] [3303 19401] [4230 3491] [6939 3491] [21385 3491] [65000 65001 19401]

Visibility estimation	135 (+- 2) out of 145 ASes (93 %)
Filtering ASes (7)	2852 2857 3491 6939 8195 8220 19401
Uncertain ASes (part of a filtering as-path segment)	5
Filtering segments (at least one filtering AS):	[2857 3491] [3303 19401] [4230 3491] [6939 3491] [21385 3491] [65000 65001 19401]

Visibility estimation	133 (+- 3) out of 145 ASes (91 %)
Filtering ASes (8)	2852 2857 3491 6939 8195 8220 19401 24489
Uncertain ASes (part of a filtering as-path segment)	7
Filtering segments (at least one filtering AS):	[2857 3491] [3303 19401] [4230 3491] [4538 24489 24287 19401] [6939 3491] [21385 3491] [65000 65001 19401]

Visibility estimation	135 (+- 2) out of 145 ASes (93 %)
Filtering ASes (7)	2852 2857 3491 6939 8195 8220 19401
Uncertain ASes (part of a filtering as-path segment)	5
Filtering segments (at least one filtering AS):	[2857 3491] [3303 19401] [4230 3491] [6939 3491] [21385 3491] [65000 65001 19401]

Visibility estimation	135 (+- 2) out of 145 ASes (93 %)
Filtering ASes (7)	2852 2857 3491 6939 8195 8220 19401
Uncertain ASes (part of a filtering as-path segment)	5
Filtering segments (at least one filtering AS):	[2857 3491] [3303 19401] [4230 3491] [6939 3491] [21385 3491] [65000 65001 19401]

Visibility estimation	133 (+- 3) out of 145 ASes (91 %)
Filtering ASes (8)	2852 2857 3491 6939 8195 8220 19401 24489
Uncertain ASes (part of a filtering as-path segment)	7
Filtering segments (at least one filtering AS):	[2857 3491] [3303 19401] [4230 3491] [4538 24489 24287 19401] [6939 3491] [21385 3491] [65000 65001 19401]

Visibility estimation	135 (+- 2) out of 145 ASes (93 %)
Filtering ASes (7)	2852 2857 3491 6939 8195 8220 19401
Uncertain ASes (part of a filtering as-path segment)	5
Filtering segments (at least one filtering AS):	[2857 3491] [3303 19401] [4230 3491] [6939 3491] [21385 3491] [65000 65001 19401]

Visibility estimation	134 (+- 3) out of 145 ASes (92 %)
Filtering ASes (7)	2852 2857 3491 6939 8195 8220 19401
Uncertain ASes (part of a filtering as-path segment)	7
Filtering segments (at least one filtering AS):	[2857 3491] [3303 19401] [4230 3491] [6939 3491] [12124 10910] [21385 3491] [65000 65001 19401]

Visibility estimation	133 (+- 3) out of 145 ASes (91 %)
Filtering ASes (8)	2852 2857 3491 6939 8195 8220 19401 24489
Uncertain ASes (part of a filtering as-path segment)	7
Filtering segments (at least one filtering AS):	[2857 3491] [3303 19401] [4230 3491] [4538 24489 24287 19401] [6939 3491] [21385 3491] [65000 65001 19401]

Visibility estimation	134 (+- 3) out of 145 ASes (92 %)
Filtering ASes (7)	2852 2857 3491 6939 8195 8220 19401
Uncertain ASes (part of a filtering as-path segment)	7
Filtering segments (at least one filtering AS):	[2857 3491] [3303 19401] [4230 3491] [6939 3491] [12124 10910] [21385 3491] [65000 65001 19401]

Visibility estimation	135 (+- 2) out of 145 ASes (93 %)
Filtering ASes (7)	2852 2857 3491 6939 8195 8220 19401
Uncertain ASes (part of a filtering as-path segment)	5
Filtering segments (at least one filtering AS):	[2857 3491] [3303 19401] [4230 3491] [6939 3491] [21385 3491] [65000 65001 19401]

Visibility estimation	133 (+- 3) out of 145 ASes (91 %)
Filtering ASes (8)	2852 2857 3491 6939 8195 8220 19401 24489
Uncertain ASes (part of a filtering as-path segment)	7
Filtering segments (at least one filtering AS):	[2857 3491] [3303 19401] [4230 3491] [4538 24489 24287 19401] [6939 3491] [21385 3491] [65000 65001 19401]

Details

AS Number	41.223.236.0 /22	116.255.0.0 /16	116.50.0.0 /21	116.0.0.0 /24	117.255.0.0 /16	117.50.0.0 /21	117.0.0.0 /24	118.255.0.0 /16	118.50.0.0 /21	118.0.0.0 /24	119.255.0.0 /16	119.50.0.0 /21	119.0.0.0 /24	120.255.0.0 /16	120.50.0.0 /21	120.0.0.0 /24
174
209
286
513
701
702
1103
1221
1239
1273
1299
1853
1930
2118
2119
2497
2516
2852
2857
2914
3216
3257
3267
3277
3303
3320
3333
3343
3356
3491
3549
3561
3741
4230
4436
4474
4538
4589
4608
4637
4777
5392
5400
5417
5511
5588
5650
6067
6320
6453
6461
6667
6695
6706
6730
6762
6881
6939
7018
7385
7575
7660
8167
8195
8210
8220
8331
8342
8359
8419
8434
8447
8468
8596
8631
8638
8642
8763
8881
8928
8943
9009
9270
10429
10764
10910
11537
12124
12350
12480
12654
12695
12779
12793
12859
12956
12976
13101
13237
13645
14361
15837
16034
16150
16186
16215
16265
16397
19401
20483
20485
20562
20640
20932
20965
21202
21385
22388
22548
22691
24287
24489
24490
25232
25462
25512
25560
25577
26943
27664
28895
28917
29222
29636
29686
30071
30844
30912
31283
34245
34347
39202
39469
65000
65001

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.