MR-3040 Unknown IP Address

Hello,

I try to make a PirateBox with my TP-Link MR-3040 router. I saw it on a blog page on this August. I did something. (Telnet, ssh etc.) But this did not work. Then i gave up. Today i try again but there is a problem: I do not know my router IP address. I try

192.168.0.1
192.168.1.1

But the terminal always say

seniorokur@dell-Inspiron-5521:~$ ssh root@192.168.1.1
ssh: connect to host 192.168.1.1 port 22: No route to host

seniorokur@dell-Inspiron-5521:~$ ssh 192.168.1.1
ssh: connect to host 192.168.1.1 port 22: No route to host

So how can i find the ip address then install OpenWrt?