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Tip: Move your mouse over the AS number and Prefix, and you will see more information
Below you see the maximum observed AS paths per day. In normal situations
one should not need to prepend more then roughly 5 times.
In some cases we
observe prepends up to 252 times.
Long AS paths in some cases can lead to serious instability, mainly due to buggy BGP
implementations
Some entries are marked with "Matches Mikrotik Bug", this means that the update matches a pattern that matches behavior seen with Mikrotik routers. For more information about that please see: http://blog.ioshints.info/2009/02/root-cause-analysis-oversized-as-paths.html
Maximum AS path length
| AS path length | update time (UTC) | announced_prefix | Prepending AS | originAS |
|---|---|---|---|---|
| 257 (251 prepends)Matches Mikrotik Bug | 2009-02-09 19:31 |
[AS path] 
|
AS45307
|
AS45307
|
| 256 (252 prepends)Matches Mikrotik Bug | 2009-02-16 18:06 |
[AS path]
|
AS47868
|
AS47868
|
| 249 (242 prepends) | 2009-03-14 18:59 |
[AS path]
|
AS48262
|
AS48262
|
| 248 (242 prepends) | 2009-03-15 00:35 |
[AS path]
|
AS48262
|
AS48262
|
| 215 (208 prepends) | 2011-01-14 19:59 |
[AS path]
|
AS3816
|
AS14080
|
| 203 (200 prepends) | 2009-08-27 06:32 |
[AS path]
|
AS39786
|
AS39786
|
| 181 (176 prepends)Matches Mikrotik Bug | 2009-02-19 22:02 |
[AS path]
|
AS20912
|
AS20912
|
| 154 (149 prepends)Matches Mikrotik Bug | 2009-12-30 08:37 |
[AS path]
|
AS39061
|
AS39061
|
| 149 (145 prepends)Matches Mikrotik Bug | 2009-04-03 17:23 |
[AS path]
|
AS8337
|
AS8337
|
| 143 (129 prepends) | 2009-02-25 20:56 |
[AS path]
|
AS44436
|
AS44436
|
| 142 (134 prepends)Matches Mikrotik Bug | 2009-04-10 08:34 |
[AS path]
|
AS48262
|
AS48262
|
| 141 (134 prepends)Matches Mikrotik Bug | 2009-03-29 23:37 |
[AS path]
|
AS48262
|
AS48262
|
| 141 (134 prepends)Matches Mikrotik Bug | 2009-04-09 13:47 |
[AS path]
|
AS48262
|
AS48262
|
| 125 (121 prepends) | 2009-07-28 17:52 |
[AS path]
|
AS39625
|
AS39625
|
| 118 (108 prepends) | 2009-02-14 00:46 |
[AS path]
|
AS39625
|
AS39625
|
| 111 (100 prepends) | 2009-08-30 04:18 |
[AS path]
|
AS38753
|
AS38753
|
| 109 (101 prepends) | 2010-05-06 12:23 |
[AS path]
|
AS39625
|
AS39625
|
| 108 (101 prepends) | 2010-04-19 02:23 |
[AS path]
|
AS39625
|
AS39625
|
| 107 (101 prepends) | 2010-05-03 11:22 |
[AS path]
|
AS39625
|
AS39625
|
| 105 (101 prepends) | 2009-07-27 09:58 |
[AS path]
|
AS39625
|
AS39625
|
| 104 (101 prepends) | 2009-10-27 22:38 |
[AS path]
|
AS39625
|
AS39625
|
| 104 (101 prepends) | 2009-10-28 00:02 |
[AS path]
|
AS39625
|
AS39625
|
| 103 (101 prepends) | 2009-10-12 12:17 |
[AS path]
|
AS39625
|
AS39625
|
| 103 (101 prepends) | 2009-10-13 11:25 |
[AS path]
|
AS39625
|
AS39625
|
| 103 (101 prepends) | 2009-10-19 21:53 |
[AS path]
|
AS39625
|
AS39625
|
| 103 (101 prepends) | 2010-04-29 09:01 |
[AS path]
|
AS33838
|
AS33838
|
| 102 (94 prepends) | 2009-07-01 04:20 |
[AS path]
|
AS32258
|
AS32258
|
| 94 (91 prepends) | 2009-10-14 02:52 |
[AS path]
|
AS39625
|
AS39625
|
| 94 (91 prepends) | 2009-10-17 04:26 |
[AS path]
|
AS39625
|
AS39625
|
| 94 (91 prepends) | 2009-10-20 05:37 |
[AS path]
|
AS39625
|
AS39625
|
| 94 (91 prepends) | 2009-10-21 01:04 |
[AS path]
|
AS39625
|
AS39625
|
| 94 (91 prepends) | 2009-10-22 16:14 |
[AS path]
|
AS39625
|
AS39625
|
| 94 (91 prepends) | 2009-10-24 16:05 |
[AS path]
|
AS39625
|
AS39625
|
| 93 (91 prepends) | 2009-10-15 05:27 |
[AS path]
|
AS39625
|
AS39625
|
| 93 (91 prepends) | 2009-10-16 11:22 |
[AS path]
|
AS39625
|
AS39625
|
| 93 (91 prepends) | 2009-10-18 22:23 |
[AS path]
|
AS39625
|
AS39625
|
| 93 (91 prepends) | 2009-10-23 07:28 |
[AS path]
|
AS39625
|
AS39625
|
| 93 (91 prepends) | 2009-10-26 11:52 |
[AS path]
|
AS39625
|
AS39625
|
| 69 (61 prepends) | 2012-02-06 13:49 |
[AS path]
|
AS38964
|
AS38964
|
| 65 (50 prepends) | 2009-07-24 10:46 |
[AS path]
|
AS38753
|
AS38753
|
| 63 (50 prepends) | 2009-09-25 17:01 |
[AS path]
|
AS38753
|
AS38753
|
| 61 (50 prepends) | 2009-11-19 03:42 |
[AS path]
|
AS38753
|
AS38753
|
| 61 (50 prepends) | 2009-11-20 07:21 |
[AS path]
|
AS38753
|
AS38753
|
| 60 (50 prepends) | 2009-09-30 11:41 |
[AS path]
|
AS38753
|
AS38753
|
| 60 (50 prepends) | 2009-11-18 12:24 |
[AS path]
|
AS38753
|
AS38753
|
| 59 (50 prepends) | 2009-10-10 11:07 |
[AS path]
|
AS38753
|
AS38753
|
| 59 (51 prepends) | 2012-01-31 13:21 |
[AS path]
|
AS38964
|
AS38964
|
| 58 (41 prepends) | 2009-04-17 11:32 |
[AS path]
|
AS18678
|
AS23216
|
| 58 (41 prepends) | 2009-04-23 07:24 |
[AS path]
|
AS18678
|
AS23216
|
| 58 (41 prepends) | 2009-05-28 07:47 |
[AS path]
|
AS18678
|
AS23216
|
| 58 (51 prepends) | 2011-09-23 15:21 |
[AS path]
|
AS50137
|
AS50137
|
| 58 (51 prepends) | 2012-02-03 11:16 |
[AS path]
|
AS38964
|
AS38964
|
| 57 (50 prepends) | 2009-12-25 18:53 |
[AS path]
|
AS38753
|
AS38753
|
| 56 (49 prepends) | 2009-03-11 12:34 |
[AS path]
|
AS9503
|
AS9503
|
| 56 (51 prepends) | 2009-07-29 00:06 |
[AS path]
|
AS39625
|
AS39625
|
| 56 (49 prepends) | 2011-02-28 14:11 |
[AS path]
|
AS197377
|
AS3.769
|
| 55 (31 prepends) | 2009-03-10 04:41 |
[AS path]
|
AS18678
|
AS23216
|
| 55 (50 prepends) | 2009-07-12 15:55 |
[AS path]
|
AS38753
|
AS38753
|
| 55 (50 prepends) | 2009-07-13 02:58 |
[AS path]
|
AS38753
|
AS38753
|
| 55 (51 prepends) | 2012-02-05 00:11 |
[AS path]
|
AS38964
|
AS38964
|
| 54 (31 prepends) | 2009-04-30 07:20 |
[AS path]
|
AS18678
|
AS28027
|
| 54 (51 prepends) | 2009-10-07 13:12 |
[AS path]
|
AS39625
|
AS39625
|
| 54 (51 prepends) | 2012-02-04 05:43 |
[AS path]
|
AS38964
|
AS38964
|
| 53 (44 prepends) | 2010-12-08 04:37 |
[AS path]
|
AS24458
|
AS4755
|
| 53 (49 prepends) | 2011-12-16 16:20 |
[AS path]
|
AS49463
|
AS49463
|
| 52 (31 prepends) | 2009-03-17 18:46 |
[AS path]
|
AS18678
|
AS23216
|
| 52 (41 prepends) | 2009-05-24 07:15 |
[AS path]
|
AS18678
|
AS27947
|
| 51 (24 prepends) | 2010-02-08 03:43 |
[AS path]
|
AS48687
|
AS48687
|
| 51 (31 prepends) | 2011-06-21 08:49 |
[AS path]
|
AS56199
|
AS56199
|
| 51 (31 prepends) | 2011-06-22 05:45 |
[AS path]
|
AS56199
|
AS56199
|
| 51 (44 prepends) | 2011-12-27 01:28 |
[AS path]
|
AS6713
|
AS6713
|
| 50 (41 prepends) | 2009-04-25 07:41 |
[AS path]
|
AS18678
|
AS27947
|
| 50 (41 prepends) | 2009-05-05 18:56 |
[AS path]
|
AS18678
|
AS19169
|
| 50 (46 prepends) | 2009-11-07 17:55 |
[AS path]
|
AS39512
|
AS39512
|
| 49 (41 prepends) | 2009-03-12 08:52 |
[AS path]
|
AS18678
|
AS27947
|
| 49 (31 prepends) | 2009-03-22 08:15 |
[AS path]
|
AS18678
|
AS23216
|
| 49 (31 prepends) | 2009-05-06 14:01 |
[AS path]
|
AS18678
|
AS19169
|
| 49 (37 prepends) | 2010-10-20 10:39 |
[AS path]
|
AS22394
|
AS22394
|
| 48 (41 prepends) | 2009-02-21 22:58 |
[AS path]
|
AS18678
|
AS23216
|
| 48 (41 prepends) | 2009-02-24 07:23 |
[AS path]
|
AS18678
|
AS23216
|
| 48 (41 prepends) | 2009-02-26 04:06 |
[AS path]
|
AS18678
|
AS23216
|
| 48 (31 prepends) | 2009-03-04 18:36 |
[AS path]
|
AS18678
|
AS23216
|
| 48 (41 prepends) | 2009-03-18 01:23 |
[AS path]
|
AS18678
|
AS23216
|
| 48 (41 prepends) | 2009-04-08 07:31 |
[AS path]
|
AS18678
|
AS23487
|
| 48 (41 prepends) | 2009-04-14 23:12 |
[AS path]
|
AS18678
|
AS23487
|
| 48 (41 prepends) | 2009-05-03 09:44 |
[AS path]
|
AS18678
|
AS27947
|
| 48 (31 prepends) | 2009-05-17 11:49 |
[AS path]
|
AS18678
|
AS19169
|
| 48 (23 prepends) | 2010-02-27 14:47 |
[AS path]
|
AS28009
|
AS28009
|
| 48 (41 prepends) | 2011-09-01 07:22 |
[AS path]
|
AS50137
|
AS50137
|
| 48 (41 prepends) | 2011-09-08 08:31 |
[AS path]
|
AS50137
|
AS50137
|
| 48 (41 prepends) | 2011-09-12 08:29 |
[AS path]
|
AS50137
|
AS50137
|
| 48 (41 prepends) | 2011-09-13 00:26 |
[AS path]
|
AS50137
|
AS50137
|
| 48 (41 prepends) | 2011-09-21 13:04 |
[AS path]
|
AS50137
|
AS50137
|
| 47 (41 prepends) | 2009-03-08 14:18 |
[AS path]
|
AS18678
|
AS23216
|
| 47 (41 prepends) | 2009-04-29 21:38 |
[AS path]
|
AS18678
|
AS23487
|
| 47 (36 prepends) | 2009-09-16 18:01 |
[AS path]
|
AS22394
|
AS22394
|
| 47 (36 prepends) | 2009-12-08 06:22 |
[AS path]
|
AS22394
|
AS22394
|
| 47 (36 prepends) | 2010-01-11 10:21 |
[AS path]
|
AS22394
|
AS22394
|
| 47 (24 prepends) | 2010-02-03 20:33 |
[AS path]
|
AS48687
|
AS48687
|
| 47 (23 prepends) | 2010-02-28 20:53 |
[AS path]
|
AS28009
|
AS28009
|
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