How to find my minecraft server ip?

I don't know why can't my friends join my server, I already set up port forwarding with the port 25565 open, the protocol is on both (TCP and UDP). Then i go to ipchicken.com to get my IP address, i get it and give my friends the ip with:25565 at the end. But for some reason they aren't able to join.

Try here http://whatismyipaddress.com/, worked for me. Make sure they type it in correct in their direct connect window IP:25565 has to have a colon between the two.

It could also be that you might have changed the server ip in the server settings. If you did you need to delete it and make it nothing and then restart the server and give them the ipchicken ip.