What does dot and square bracket means in the result of Windows Tracert Command

I ran a Trace Route command in the Command Prompt in Windows 8, the result is

C:UsersO83544>tracert cnproject.sharepoint.cn

Tracing route to prodnet3-7ipv4a0001.sharepoint.cn.akadns.net [42.159.166.25]
over a maximum of 30 hops:

  1     6 ms     6 ms     9 ms  192.168.16.1
  2     9 ms    28 ms    19 ms  . [211.136.161.109]
  3    29 ms    30 ms    33 ms  . [211.136.190.189]
  4     7 ms     8 ms     7 ms  . [211.136.189.2]
  5     *        *        *     Request timed out.

I am wondering what does the dot and the square bracket mean in

. [211.136.161.109]

Thanks!

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