![]() To determine the broadcast address for this subnet us the OR operator with 0x7FFF (all 15 host bits turned on for broadcast), 0xC0A0E73C OR 0x7FFF = 0xC0A8FFFF, or 192.168.255.255. The host number is derived by ANDing with the last 15 bits (hex value 0x7FFF), 0xC0A8E73C AND 0x7FFF giving 0圆73C (103.60 in dotted decimal). Plug in the address 0xC0A8E73C, AND it with your subnetmask of 0xFFFF8000 and you get 0xC0A88000 (192.168.128.0 in dotted decimal. SUBNET MASK TABLE FOR CLASS B WINDOWSThe network number can be derived using the Windows calculator in scientific mode with the logical AND function. Convert this to hex and you get 0xC0A8E73C. I think this is also the answer to your question "what will come after "/" for that particular pool of Ip", in this case Net/17.Ī real world example, say one of your hosts is 192.168.231 60. All zeroes isn't valid for a host number, and all ones is the broadcast address for that subnet, leaving 32766 possible host addresses for this subnet. 15 bits covers the range 0 through 32767, which is 32768 different values. So you have 17 bits making up the network number, and 15 bits for the host numbers. The 'line' separating the network and host numbers would be here ġ 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 I prefer to use hexadecimal notation for this process, as it's easier (for me) to convert hex to binary. The bits to the left of the line make up the network number, the bits to the right are used to identify the hosts on that network. The subnet mask essentially defines where you draw a line somewhere in the middle of these bits. There's a guy here named Jerry that put together a nice detailed simplification of this subject, hopefully he saved that email.īasically every IPv4 IP address is a string of 32 bits. ![]()
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