If you are using DHCP, the norm in a home network, then the IP addresses are allocated automatically by the DHCP server. This server is usually a Router or Modem/Router.
IP addresses in this sort of home network are usually 192.168.x.x
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If a computer has an IP address beginning with 169.x, that indicates that the computer did not receive an IP address from the DHCP server so it allocated one to itself. (169.x.x.x = Self assigned IP address)