king kong what exactly are your trying to achieve? IP address's are merely a way of communicating to each other. like when you have something to say to joe on 3rd floor, you know that you can call him on extension 208 and he'll pick up and listen to what you have to say (check out OSI Model). and whats this about plus point and negative point? Security implemented at an IP level?? no such thing, unless your talking about segregating your Network, like i said you need to tell us what your trying to achieve. (if this then do this)

IPs have 4 octets(8bits per octet making 32bits) but we also have IPv6 which is 128 bits in a whole different ball game (hexa). I advise you to break down your question, then guys in here can help. cheers man