也可以用 ipconfig （windows) to find out your router's address

In a command prompt, type in ipconfig. Look for wireless LAN adapter in the result. 

Here is an example output. Default Gateway shown is your router.

Wireless LAN adapter Wireless Network Connection:

   Connection-specific DNS Suffix  . :

   IPv4 Address. . . . . . . . . . . : 192.168.101.103

   Subnet Mask . . . . . . . . . . . : 255.255.255.0

   Default Gateway . . . . . . . . . : 192.168.101.1