Wireshark Display Filter by IP Range

(ip.src >= 192.168.0.0 && ip.src <= 192.168.0.255) || (ip.dst >= 192.168.0.0 && ip.dst <= 192.168.0.255)

States that the packet should have a source address greater than or equal to 192.168.0.0 AND less than or equal to 192.168.0.255.  Or it could have a destination address greater than or equal to 192.168.0.0 AND less than or equal to 192.168.0.255.