Hmm, I just read some of the posts above. Time for a tech lesson. There are a finite number of IP addresses (version 4 is what we currently use) equal to the 2^32 power. IP address conflicts on the internet are a serious problem that doesn't occur frequently (if at all) to my knowledge. However, every user on this forum uses a single external address that is shared with every device on their network. The point of this is to conserve the limited number of addresses. There are three "classes" of internal addresses (A, B, and C) that are used to perform network address translation (NAT) which, allows a single router with an external address to give multiple internal addresses to each device connected to that router. This means that people share internal addresses all the time, but these addresses are masked by the external address.
The password can be found on the back of the router but it should always be changed. @Jacoby_Elderfun1