I'm needing a ip number for my roku stick help

Hello
On your phone, open Settings and check your network's IP address.

1.Go to Settings > Wi-Fi > Your network name and write down the number next to "IP Address."
2.Your IP address will be a four-part number (e.g. 192.168.0.125).
3.Now, check the IP address of your Roku device. For any help or support just visit us: Roku Com Link

You cannot get an Roku IP address from a serial number - they have not relationship.

This should help you:
http://www.scottallen.com/2013/04/how-to-fix-a-roku-that-wont-connect-to-the-internet/

Check the IP addresses of the units. They may have the same IP number. If they do assign each of the items in your network a static IP and it should work.

You will need to login to your wireless router on your computer to get, or set, your network password for "Home_B698". A typical default router IP address is 192.168.0.1, but there can be any number of possibilities depending on router type, and network configuration, and who set it up... Some routers will put their default IP Address, and password on a sticker, located somewhere on the router. If this is the case, type the default IP Address into a browser on your computer, and hit enter, or return. A web page should appear asking for login information... User name, and password. Again this information varies... Typically the default user name is "Admin" or "admin" you can also try leaving this field blank, and just entering the password found on the router. In some cases the password is actually "admin" while leaving the user name blank.
If your successful at loging-in, you need to look at your wireless settings, under one of the sub-tabs you should find a password field indicating your network password. This is what should allow you to login to your network with your Roku device.

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Actually PUK is different for all SIM's for PUK you need contact network operator with number of which you want PUK code(you call to customer care from any others number who have same network operator. Dont enter wrong PUK more than 10times