Viewing AS-Path in Browser

Lessons Discussion
1

Is there a way of viewing the BGP AS-Path used to reach a certain website in a browser? e.g. I am with Virgin Media UK (AS5089) and I visit NetworkLessons (AS20857) and would like to see in the browser which AS-Path was used to connect.

2

Hi Mark,

I doubt there are any websites that show this. There are quite some websites that offer a visual traceroute but I doubt any of them show the AS numbers.

You can see it on a looking glass router though, this will show the AS numbers. Here’s an example:

route-server.as3257.net>traceroute 149.210.239.44 

Type escape sequence to abort.
Tracing the route to networklessons.com (149.210.239.44)

  1 xe-9-0-0-3.fra23.ip4.tinet.net (213.200.64.93) [AS 3257] 0 msec 0 msec 4 msec
  2 xe-11-0-0.fra61.ip4.gtt.net (89.149.184.65) [AS 3257] 0 msec 0 msec
    xe-9-1-0.fra61.ip4.gtt.net (141.136.107.62) [AS 3257] 0 msec
  3 ae-12.r02.frnkge04.de.bb.gin.ntt.net (77.67.82.10) [AS 3257] 8 msec 0 msec 4 msec
  4 ae-3.r20.frnkge04.de.bb.gin.ntt.net (129.250.3.93) [AS 2914] 24 msec 4 msec 0 msec
  5 ae-1.r25.amstnl02.nl.bb.gin.ntt.net (129.250.3.179) [AS 2914] 8 msec 8 msec 8 msec
  6 ae-1.r03.amstnl02.nl.bb.gin.ntt.net (129.250.2.147) [AS 2914] 8 msec
    ae-2.r02.amstnl02.nl.bb.gin.ntt.net (129.250.2.159) [AS 2914] 8 msec 12 msec
  7 xe-0-4-0-28.r02.amstnl02.nl.ce.gin.ntt.net (81.20.64.90) [AS 2914] 8 msec 8 msec 8 msec
  8 v633.coreswitch2.dcgd.ams.transip.net (87.253.141.234) [AS 20857] 8 msec 12 msec 8 msec
  9 v652.switch1.pool12.transip.nl (87.253.159.187) [AS 20857] 12 msec 12 msec 12 msec

Rene