A sniffer would only show TCP/IP addresses that are actually active. Typically a router in a home network will use 196.168.0.0 through 192.168.255.255, and the addresses used by individual devices will be in that range. Normally devices use DHCP and simply ask the router for an ip address, which the device then uses.
Still don't see the point of trying to get all the ip addresses unless you are trying to break into something or perform other nefarious activities.