or you can use 10.0.0.0 The subnet mask for this one is 255.0.0.0
The 192.168.0.1 subnet mask is 255.255.255.0
Depending on Operating system there are different ways to assign the IP addressing. Right click (and Properties) on the Network icon will get you started.
But until the OP shows up again with (much) requested info, I don't see the point in continuing further.
And I am using a dial up USB modem but it needs not to be connect every time when I start my PC if I always plug in the USB modem. This ISP provides me two series of dynamic IPs. One 172.xxx.xxx.xxx and 180.xxx.xxx.xxx
- What networking interfaces do each of the 4 Desktop PCs, 2 Laptops, and one printer presently have?
- Will any of the machines be sufficiently close together and in fixed positions so as to make wired connections feasible?
- Which computers will need access to the printer?
- What operating systems are on each of the 6 computers.
As for I'net connectivity, you are not going to be able to have access from all machines using a single dial-up line without adding a multiplexer between them and the modem.